Journal articles: 'Gage repeatability and reproducibility'

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Sweeney, Shannon. "Analysis of Two-dimensional Gage Repeatability and Reproducibility." Quality Engineering 19, no. 1 (December 21, 2006): 29–37. http://dx.doi.org/10.1080/08982110601057641.

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Shirodkar, Ameya, and Suraj Rane. "Evaluation of Coordinate measuring machine using Gage Repeatability & Reproducibility." International Journal of System Assurance Engineering and Management 12, no. 1 (January 9, 2021): 84–90. http://dx.doi.org/10.1007/s13198-020-01050-2.

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Snee, Ronald D. "Interpreting operator-part interaction in gage repeatability and reproducibility studies." Quality Engineering 33, no. 3 (June 11, 2021): 395–403. http://dx.doi.org/10.1080/08982112.2021.1874013.

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Krumm, Dominik, Stefan Schwanitz, and Stephan Odenwald. "How to Assess Repeatability and Reproducibility of a Mechanical Test? An Example for Sports Engineers." Proceedings 49, no. 1 (June 15, 2020): 122. http://dx.doi.org/10.3390/proceedings2020049122.

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Several sources of variation can affect the performance of a mechanical test. Hence, the measurement system performance should be assessed. The gage repeatability and reproducibility study is a method used to assess and quantify the variation of a mechanical test. Since it seems that this method has not yet found its way into the field of sports engineering, this paper promotes its application by demonstrating a practical example based on a current problem in sports shoe development. In detail, a novel mechanical simulation to determine the forefoot bending stiffness of athletic footwear during plantar flexion movement was developed and its quality assessed. The ANOVA Gage R&R study was performed based on 64 randomized trials of eight footwear samples assessed by two appraisers. The mechanical test was evaluated as acceptable for the desired application and the resolution was quantified to be 0.04 Nm/°.

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Klaput, Pavel, David Vykydal, and Jiří Plura. "Effect of Non-Fulfillment of Assumptions on Gage Repeatability and Reproducibility Study Evaluation." Quality Production Improvement - QPI 1, no. 1 (July 1, 2019): 472–78. http://dx.doi.org/10.2478/cqpi-2019-0064.

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Abstract The evaluation of the measurement system quality has already become an integral part of quality planning activities in both the automotive and metallurgical industries. An important assumption for obtaining the most relia ble results is compliance with the basic assumptions for evaluating the variability of the measurement system. The main goal of this paper is to analyze, how the failure to meet the basic assumptions influences the evaluation of the measurement system's statistical properties. This goal is achieved by performing a detailed analysis of the latest developments in the field of measurement systems analysis aimed at verifying the assumptions of normality and uniformity. The evaluation of the effect of non-fulfillment of both assumptions on the values of the most important statistical properties of the measurement system is performed using simulated data. Suitable graphical tools are used for practical verification of both assumptions.

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Dalalah, Doraid, and Khalid Alkhaledi. "Measurement system analysis of viscosity: a Six-Sigma gage repeatability and reproducibility analysis." International Journal of Quality Engineering and Technology 8, no. 3 (2021): 229. http://dx.doi.org/10.1504/ijqet.2021.10039911.

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Alkhaledi, Khalid, and Doraid Dalalah. "Measurement system analysis of viscosity: a Six-Sigma gage repeatability and reproducibility analysis." International Journal of Quality Engineering and Technology 8, no. 3 (2021): 229. http://dx.doi.org/10.1504/ijqet.2021.116755.

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Requena Pérez, Mariano, Álvaro Zubizarreta-Macho, Pedro Colino Gallardo, Alberto Albaladejo Martínez, Daniele Garcovich, and Alfonso Alvarado-Lorenzo. "Novel Digital Measurement Technique to Analyze the Palatine Suture Expansion after Palatine Rapid Maxillary Expansion Technique." Journal of Personalized Medicine 11, no. 10 (September 27, 2021): 962. http://dx.doi.org/10.3390/jpm11100962.

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The aim of the study was to validate a novel digital measurement method to quantify the volume of the midpalatal suture after rapid maxillary expansion (RME). Material and methods: Eight patients with maxillary skeletal transverse deficiency were submitted to palatine suture expansion using the McNamara orthodontic appliance during a period of nine months. After 30 days of treatment, all patients were exposed postoperatively to a cone-beam computed tomography (CBCT) scan. Afterwards, the scans were uploaded into the three-dimensional orthodontic-planning software to allow the volumetric assessment of the palatine suture expansion through palatine rapid maxillary expansion using a McNamara appliance. The repeatability was analyzed by repeating twice the measures by a single operator and reproducibility was analyzed by repeating three times the measures by two operators, and Gage R&R statistical analysis was performed. Results: The expansion of the midpalatal suture by means of the rapid maxillary expansion technique, in terms of digital volume measurement, showed a repeatability value of 0.09% and between the two operators a reproducibility value of 0.00% was shown. Conclusions: The novel measurement technique demonstrated a high repeatability and reproducibility rate for volume assessment of the palatine suture expansion through palatine rapid maxillary expansion technique.

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Mustapha, Ghazirah, M. Saiful Aizat Shafie, Nur Hayati M. Yahaya, and Jamaluddin Mahmud. "Measurement System Analysis of VS Lite." Applied Mechanics and Materials 680 (October 2014): 447–50. http://dx.doi.org/10.4028/www.scientific.net/amm.680.447.

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Virtual Sensei Lite (VS Lite) is an inexpensive user-friendly motion analysis system. As an alternative motion capture system, it is a must for VS Lite’s user to assess the accuracy of the measurement system capability. To date, such analysis to observe the reliability and accuracy of VS Lite has not been reported. Therefore, this study proposes a procedure for assessing the accuracy and capability of the Virtual Sensei Lite using ANOVA Gage Repeatability and Reproducibility (Gage R&R) designed experiments. In this procedure, a gage R&R study is conducted to obtain replicate measurements on nine parts by three operators. The total variation due to measurement error is then observed to identify the accuracy of measurement. The study able to demonstrate on the accuracy of VS Lite as the value of total variation due to measurement error is within 10%-30%.

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Michalski, R., M. Wieczorowski, B. Gapiński, and P. Glazowski. "The use of Gage R&R in suitability analysis of a CMM used at FAMOT Pleszew." Archives of Mechanical Technology and Materials 40, no. 1 (January 1, 2020): 1–6. http://dx.doi.org/10.2478/amtm-2020-0001.

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AbstractThe subject of the article is the suitability analysis of a measuring system, specifically the Zeiss MMZ T 20 30 16 coordinate-measuring machine utilizing an extended procedure.The article outlines the measurement preparation process and presents the research station as well as the procedure for determining Repeatability & Reproducibility (R&R).

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Shaitelman, Simona Flora, Susan E. Ferguson, Sarah Marie DeSnyder, Parviz Kheirkhah, Susan Lilly, Marigold Travis, Theresa Johnson, et al. "Initiating a lymphedema screening program for breast cancer patients: Determining variability as a first step towards standardization." Journal of Clinical Oncology 34, no. 7_suppl (March 1, 2016): 267. http://dx.doi.org/10.1200/jco.2016.34.7_suppl.267.

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267 Background: Breast cancer-related lymphedema (BCRL) is a known morbidity from treatment, and yet published estimates of its incidence are highly variable. Typically, a single volume measurement is recorded and the degree of intra-rater variability undefined. A threshold 5% limb volume change over time is used to define “mild lymphedema.” Therefore, small variations in volume measurements could substantially lead to over or under-diagnosis of BRCL. Gage R&R is a measurement systems analysis tool that quantifies the amount of variability induced in measurements by the measurement system itself and compares this to the total variability observed. The objective of this study was to define the degree of variability in perometer arm volume measurements and factors contributing to this. Methods: A medical assistant (MA) was trained by a certified lymphedema therapist (CLT) to perform perometer-based lymphedema screening in the MD Anderson Nellie B. Connally Breast Center. Three measurements of each arm were taken and intra-rater variability against the mean calculated. Gage R&R testing was performed by the MA and CLT, to determine the degree of repeatability and reproducibility variation. As a part of this analysis, 30 patients had both their left and right arm volume measured 3 times by each measurer. Results: Over 6 months, 565 breast cancer patients had preoperative BCRL screening by the MA, with an overall intra-rater variability of 2.2%. Among the 30 patients in the Gage R&R study, median body mass index (BMI) was 27.7 (range 19.7-38.3), median height 1.61m (range 1.52-1.73m), intrarater variability of the MA was 2.07% and of the CLT was 1.21%. Gage R&R accounted for 4.77% of total variability, 1.26% repeatability and 3.51% reproducibility. Regression analysis demonstrated that patient BMI and height impacted variability in measurements (R2= 16.27). Conclusions: Intra-rater variability for perometer arm measurements diminishes with experience. Gage R&R variability is acceptable per industry standards, but there is room for improvement. Our findings suggest a role for targeted interventions to minimize variability in the diagnosis of BCRL based on patient characteristics.

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Carrión García, Andrés, and Angela Grisales del Río. "Number of distinct data categories and gage repeatability and reproducibility. A double (but single) requirement." Measurement 46, no. 8 (October 2013): 2514–18. http://dx.doi.org/10.1016/j.measurement.2013.04.065.

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Neve, Nishant. "Analysis of Automated differential Multi-gauging System through Gauge Repeatability and Reproducibility (GRR)." Revista Gestão Inovação e Tecnologias 11, no. 4 (July 10, 2021): 1758–71. http://dx.doi.org/10.47059/revistageintec.v11i4.2234.

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Abdelgadir, Mahjoub, Chris Gerling, and Joel Dobson. "Variable data measurement systems analysis: advances in gage bias and linearity referencing and acceptability." International Journal of Metrology and Quality Engineering 11 (2020): 16. http://dx.doi.org/10.1051/ijmqe/2020010.

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Measurement systems analysis (MSA) is a set of requirements and procedures adopted by the automotive industry and other disciplines to evaluate the accuracy and precision of measurement systems through assessing and quantifying the random and systematic errors and assigning appropriate dispositions for tolerance and performance acceptance. The methodology of variable data MSA comprises studies of a system's stability, bias, linearity and gage repeatability and reproducibility (GR&R). This paper describes advances in referencing and criteria for estimation of uncertainty errors, dispositions, and acceptability of MSA bias and linearity, proposing an extension to the basic statistical zero null-hypothesis to include overlap between confidence intervals and uncertainty associated with the reference standards used in bias and linearity studies.

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Cox, Steven, Virginia Elton, John A. Garside, Apostolos Kotsialos, João Victor Marmo, Lorena Cunha, Grant Lennon, and Chris Gill. "A new method to improve the objectivity of early Six Sigma analysis." International Journal of Quality & Reliability Management 33, no. 9 (October 3, 2016): 1364–93. http://dx.doi.org/10.1108/ijqrm-02-2015-0023.

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Purpose A process improvement sampling methodology, known as process variation diagnostic tool (PROVADT), was proposed by Cox et al. (2013). The method was designed to support the objectivity of Six Sigma projects performing the measure-analyse phases of the define-measure-analyse-improve-control cycle. An issue in PROVADT is that it is unable to distinguish between measurement and product variation in the presence of a poor Gage repeatability and reproducibility (R&R) result. The purpose of this paper is to improve and address PROVADT’s sampling structure by enabling a true Gage R&R as part of its design. Design/methodology/approach This paper derives an enhanced PROVADT method by examining the theoretical sampling constraints required to perform a Gage R&R study. The original PROVADT method is then extended to fulfil these requirements. To test this enhanced approach, it was applied first to a simulated manufacturing process and then in two industry case studies. Findings The results in this paper demonstrates that enhanced PROVADT was able to achieve a full Gage R&R result. This required 20 additional measurements when compared to the original method, but saved up to ten additional products and 20 additional measurements being taken in future experiments if the original method failed to obtain a valid Gage R&R. These benefits were highlighted in simulation and industry case studies. Originality/value The work into the PROVADT method aims to improve the objectivity of early Six Sigma analyses of quality issues, which has documented issues.

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Ozturkoglu, Yucel, Yigit Kazancoglu, Muhittin Sagnak, and Jose Arturo Garza-Reyes. "Quality Assurance for Operating Room Illumination through Lean Six Sigma." International Journal of Mathematical, Engineering and Management Sciences 6, no. 3 (June 1, 2021): 752–70. http://dx.doi.org/10.33889/ijmems.2021.6.3.045.

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Since every mistake made in the healthcare industry can cause permanent harm or even death, some fundamental requirements should be considered when planning and designing operating rooms. Lighting is one of the most important ergonomic factors, especially for operating rooms. This paper investigates the integration of the lean approach and six sigma in measuring the efficiency of LED technology, which can also be regarded as a factor affecting the operating room efficiency. Measurement System Analysis (MSA) and Gage Control methods were applied to determine measurement variability in operating room illumination measurement process. Repeatability and reproducibility (%R&R) was found 12.89%. After calibration, %R&R value was found 8.21%, which implies that calibration helped reduce variability.

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Rocha, Hermes S. da, Patricia A. A. Marques, Antonio P. de Camargo, Douglas L. dos Reis, Eric A. da Silva, and José A. Frizzone. "Dripper testing: Application of statistical quality control for measurement system analysis." Revista Brasileira de Engenharia Agrícola e Ambiental 21, no. 9 (September 2017): 587–93. http://dx.doi.org/10.1590/1807-1929/agriambi.v21n9p587-593.

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ABSTRACT Laboratory tests for technical evaluation or irrigation material testing involve the measurement of many variables, as well as monitoring and control of test conditions. This study, carried out in 2016, aimed at using statistical quality control techniques to evaluate results of dripper tests. Exponentially weighted moving average control charts were elaborated, besides capability indices for the measurement of the test pressure and water temperature; and study on repeatability and reproducibility (Gage RR) of flow measurement system using 10 replicates, in three work shifts (morning, afternoon and evening), with 25 emitters. Both the test pressure and water temperature remained stable, with “excellent” performance for the pressure adjustment process by integrative-derivative proportional controller. The variability between emitters was the component with highest contribution to the total variance of the flow measurements, with 96.77% of the total variance due to the variability between parts. The measurement system was classified as “acceptable” or “approved” by the Gage RR study; and non-random causes of significant variability were not identified in the routine of tests.

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Zubizarreta-Macho, Álvaro, Martina Triduo, Jorge Alonso Pérez-Barquero, Clara Guinot Barona, and Alberto Albaladejo Martínez. "Novel Digital Technique to Quantify the Area and Volume of Cement Remaining and Enamel Removed after Fixed Multibracket Appliance Therapy Debonding: An In Vitro Study." Journal of Clinical Medicine 9, no. 4 (April 12, 2020): 1098. http://dx.doi.org/10.3390/jcm9041098.

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The aim of this study was to construct a novel, repeatable, reproducible, and accurate measurement protocol for the area and volume of the remaining cement after removal of fixed multibracket appliances, the area and volume of remaining cement after cement removal, the area and volume of enamel removed after cement removal, and the volume of cement used to adhere fixed multibracket appliances. A total of 30 brackets were cemented and removed with over 30 extracted teeth embedded into three experimental models of epoxy resin. The models were scanned before and after bracket placement, bracket debonding, and polishing the remaining cement. The brackets were submitted to micro-computed tomography. The standard tessellation language digital files were aligned, segmented, and re-aligned using geomorphometric software. The digital measurement technique accuracy, repeatability, and reproducibility were analyzed using Gage R&R statistical analysis. The variability attributable to the area and volume measurement techniques of the total variability of the samples was 0.70% and 0.11% for repeatability, respectively, and 0.79% and 0.01% for reproducibility, respectively. The re-alignment procedure is a repeatable, reproducible, and accurate technique that can be used to measure the area and volume of the remaining cement after removal of fixed multibracket appliances, the area and volume of remaining cement after cement removal, the area and volume of enamel removed after cement removal, and the volume of cement used to adhere the fixed multibracket appliance.

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Belanche Monterde, Alba, Alberto Albaladejo Martínez, Alfonso Alvarado Lorenzo, Adrián Curto, Jorge Alonso Pérez-Barquero, Clara Guinot-Barona, and Álvaro Zubizarreta-Macho. "A Repeatable and Reproducible Digital Method to Quantify the Cement Excess and Enamel Loss after Debonding Lingual Multibracket Appliance Therapy." Applied Sciences 11, no. 3 (February 1, 2021): 1295. http://dx.doi.org/10.3390/app11031295.

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The aim of the present study is to present a repeatable, reproductible, and accurate morphometric measurement method for measuring and quantifying the area and volume of cement that remains after fixed lingual multibracket appliance debonding, enamel loss after fixed lingual multibracket appliance debonding, and the volume of cement used to adhere fixed lingual multibracket appliances. Ten conventional lingual brackets were cemented in 10 extracted teeth embedded into an epoxy resin model simulating a dental arch. This model was scanned before and after bonding the lingual brackets, after debonding, and after polishing the surfaces. We also performed a Micro-Computed Tomography scan of the lingual brackets used. Afterward, the standard tessellation language (STL) digital file was aligned, each tooth was segmented individually, and the file was re-aligned using engineer morphometry software. Inter-operator and intra-operator comparative analyses were performed using the ANOVA test, and the repeatability and reproducibility of the morphometric measurement technique were analyzed using Gage R&R statistical analysis. Repeatability showed 0.07% and 0.16% variability associated with the area and volume measures, respectively, while reproducibility showed 0.00% variability associated with the area and volume measures, respectively. In conclusion, the morphometric measurement technique is a repeatable, reproductible, and accurate morphometric measurement method for quantifying the area and volume of cement that remains after fixed lingual multibracket appliance debonding, enamel loss after fixed lingual multibracket appliance debonding, and the volume of cement used to adhere fixed lingual multibracket appliances.

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Udroiu, Razvan, and Ion Cristian Braga. "System Performance and Process Capability in Additive Manufacturing: Quality Control for Polymer Jetting." Polymers 12, no. 6 (June 4, 2020): 1292. http://dx.doi.org/10.3390/polym12061292.

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Polymer-based additive manufacturing (AM) gathers a great deal of interest with regard to standardization and implementation in mass production. A new methodology for the system and process capabilities analysis in additive manufacturing, using statistical quality tools for production management, is proposed. A large sample of small specimens of circular shape was manufactured of photopolymer resins using polymer jetting (PolyJet) technology. Two critical geometrical features of the specimen were investigated. The variability of the measurement system was determined by Gage repeatability and reproducibility (Gage R&R) methodology. Machine and process capabilities were performed in relation to the defined tolerance limits and the results were analyzed based on the requirements from the statistical process control. The results showed that the EDEN 350 system capability and PolyJet process capability enables obtaining capability indices over 1.67 within the capable tolerance interval of 0.22 mm. Furthermore, PolyJet technology depositing thin layers of resins droplets of 0.016 mm allows for manufacturing in a short time of a high volume of parts for mass production with a tolerance matching the ISO 286 IT9 grade for radial dimension and IT10 grade for linear dimensions on the Z-axis, respectively. Using microscopy analysis some results were explained and validated from the capability study.

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Bueno, Jéssica Naihara Nunes. "Implantação da Ferramenta Gage R&R em uma Indústria de Embalagens." Revista de Ciências Exatas e Tecnologia 13, no. 13 (December 30, 2018): 38. http://dx.doi.org/10.17921/1890-1793.2018v13n13p38-46.

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A proposta deste artigo é avaliar o sistema de medição em um estudo de caso utilizando a ferramenta Gage R&R, com o objetivo de descobrir a variação das medições, podendo ser por Repetibilidade e/ou Reprodutibilidade. Na ferramenta DMAIC utilizada no Seis Sigma, a etapa Medir é usualmente a mais complicada e demorada pela baixa qualidade dos sistemas de medições da maioria das empresas. Pretende-se uma revisão literária para melhor conhecimento do assunto, assim, a primeira etapa foi a criação de um procedimento para a empresa em estudo. Após a elaboração do procedimento, os colaboradores foram treinados e a gerência definiu as principais inspeções que afetam o produto para a realização do estudo. Em seguida, a ferramenta foi aplicada e cada saída foi analisada comprovando a presença de variações que poderiam não ser consideradas. Palavras-chave: Sistema de medição. DMAIC. Gage R&R. Abstract The proposal is to evaluate the measurement system in a case study using the tool Gage R & R in order to find the variation of the measurements may be for repeatability and / or reproducibility. The tool used in Six Sigma DMAIC, the Measure step is usually the most complicated and delayed by the poor quality of measurement systems of most companies. We performed a literature review to better knowledge of the subject, so the first step was to create a procedure for the company under study. Following completion of the procedure were trained employees and management identified key inspections that affect the product for the study. Then the tool was applied and each output was analyzed demonstrating the presence of variations that could not be considered. Keywords: Measurement System. DMAIC. Gage R&R.

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Barbosa, G. F., G. F. Peres, and J. L. G. Hermosilla. "R&R (repeatability and reproducibility) gage study applied on gaps’ measurements of aircraft assemblies made by a laser technology device." Production Engineering 8, no. 4 (May 13, 2014): 477–89. http://dx.doi.org/10.1007/s11740-014-0553-z.

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Deshpande, Amol A., Ayyalasomayajula Ramya, Vavilala Vishweshwar, Girish R. Deshpande, and Amrendra Kumar Roy. "Applications of Gage Reproducibility & Repeatability (GRR): Understanding and Quantifying the Effect of Variations from Different Sources on a Robust Process Development." Organic Process Research & Development 18, no. 12 (December 8, 2014): 1614–21. http://dx.doi.org/10.1021/op5002935.

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Espasandin, Ana C., Verónica Gutierrez, Alberto Casal, Ana Graña, Oscar Bentancur, and Mariana Carriquiry. "Modeling Lactation Curve in Primiparous Beef Cattle." Journal of Agricultural Science 8, no. 4 (March 11, 2016): 116. http://dx.doi.org/10.5539/jas.v8n4p116.

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<p>The work describes lactation curves and compares two methods to estimate milk yield (MY) in a grazing beef cattle herd of the EEBR Station-Udelar, Uruguay. Twenty-four Hereford, Angus and F1-crossbreed primiparous cows were used to estimate MY once a month, from birth to weaning, by weigh-suckle-weigh (WSW) technique and milking-machine (MM). Milk yield (MY), milk yield retained energy (ReMY), and calf weight were analyzed as repeated measures in a model including: sex of calves, month of lactation, cow and calf breed, milking method, estimation day (1 or 2), and post-partum days as fixed effects, and cow nested within breed as the random effect. The correlation analysis and the Gage r&R coefficient (repeatability and reproducibility) between the two methods were used to study their associations. Lactation curves were compared (AICC and BIC) using Wood (1964), and Jenkins and Ferrel (1984) models. The MY estimated differed with the methodology being WSW higher than MM (P < 0.001). The r&R coefficient (0.83) suggest lower associations between WSW and MM, being 18% and 6% the coefficients of variation, respectively. Cow breed was not significant for MY. Calf live weight and ReMY were negatively associated (-0.52, P < 0.0001). Based on variability observed, MM is more accurate to estimate MY and Wood curve the most adjusted to describe lactation in grazing beef cattle.</p>

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Reilly, Francis. "Accuracy, repeatability, reproducibility." Metal Finishing 102, no. 5 (May 2004): 8–9. http://dx.doi.org/10.1016/s0026-0576(04)90151-1.

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CASSEY, PHILLIP, and TIM M. BLACKBURN. "Reproducibility and Repeatability in Ecology." BioScience 56, no. 12 (2006): 958. http://dx.doi.org/10.1641/0006-3568(2006)56[958:rarie]2.0.co;2.

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Reilly, Francis. "Understanding accuracy, repeatability and reproducibility." Metal Finishing 105, no. 10 (2007): 537–38. http://dx.doi.org/10.1016/s0026-0576(07)80372-2.

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Caudill, S. P., and D. J. Boone. "Analytical variance and definition of a reference change as a function of calcium concentration." Clinical Chemistry 32, no. 2 (February 1, 1986): 308–13. http://dx.doi.org/10.1093/clinchem/32.2.308.

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Abstract Using data from the Centers for Disease Control (CDC) Proficiency Testing (PT) Surveys, we obtained estimates of repeatability (intralaboratory variability between results on the same material) and reproducibility (interlaboratory variability between results on the same material) for the Technicon SMA 6 (or 12/60) and SMAC 1 (or II) systems used with cresolphthalein complexone methodology to measure serum calcium. The two systems were comparable in terms of short-term (within-day) repeatability, long-term (three to six months) repeatability, short-term (one to two weeks) reproducibility, and long-term (three to six months) reproducibility. The long-term repeatability was essentially the same as the long-term reproducibility. Short-term repeatability, long-term repeatability, and long-term reproducibility increased linearly with increased calcium concentration over the range 1.75 to 2.95 mmol/L; short-term reproducibility showed no significant change over this range. The effect of analytical variance on the definition of a reference change in semiannual calcium measurements was demonstrated.

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Ellison, Stephen L. R., Pauline Key, and Roger Wood. "The Interlaboratory Performance of Microbiological Methods for Food Analysis." Journal of AOAC INTERNATIONAL 95, no. 5 (September 1, 2012): 1433–39. http://dx.doi.org/10.5740/jaoacint.11-452.

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Abstract Repeatability and reproducibility data for microbiological methods in food analysis were collated and assessed with a view to identifying useful or important trends. Generalized additive modeling for location, shape, and scale was used to model the distribution of variances. It was found that mean reproducibility for log10 (CFU) data is largely independent of concentration, while repeatability SD of log10 (CFU) data shows a strongly significant decrease in repeatability SD with increasing enumeration. The model for reproducibility SD gave a mean of 0.44, with an upper 95th percentile of approximately 0.76. Repeatability variance could be described reasonably well by a simple dichotomous model; at enumerations below 105/g, the model for repeatability SD gave a mean of approximately 0.35 and upper 95th percentile of 0.63. Above 105/g, the model gave a mean of 0.2 and upper 95th percentile of 0.36. A Horwitz-like function showed no appreciable advantage in describing the data set and gave apparently worse fit. The relationship between repeatability and reproducibility of log10 (CFU) is not constant across the concentration range studied. Both repeatability and reproducibility were found to depend on matrix class and organism.

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De Rycke, Lieve, Aldo Vezzoni, Ingeborgh Polis, Jimmy Saunders, Bart Broeckx, and Mileva Bertal. "Technical Repeatability and Reproducibility of the Stress Radiographs Performed with the Vezzoni-Modified Badertscher Hip Distension Device." Veterinary and Comparative Orthopaedics and Traumatology 32, no. 01 (January 2019): 067–72. http://dx.doi.org/10.1055/s-0038-1676306.

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Objective The aim of this study was to evaluate the repeatability and reproducibility of the radiographical stress technique using the Vezzoni-modified Badertscher distension device (VMBDD). Materials and Methods Stress radiographs of 10 dogs obtained with the VMBDD were performed consecutively by two different operators and then measured twice by a third veterinarian. The technical repeatability was first assessed individually for the two operators who took the stress radiographs, followed by the technical reproducibility. The obtained variances were used to calculate the 95% limits of agreement for the measurement repeatability, the technical repeatability and the technical reproducibility. Results Both the technical repeatability and reproducibility of the VMBDD technique were good, with the 95% limits of agreement of the measurement repeatability and technical repeatability equalling ± 0.07 overall, and the 95% limits of agreement of the technical reproducibility being ± 0.09. Clinical Significance These results, in combination with the previous results for the measurement of the laxity index, support the use of the VMBDD as a reliable in-house evaluation method to assess the hip joint by trained clinicians. For screening purposes, however, we suggest to limit the number of evaluators, to limit the variability.

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Martín, Raúl, Maria Izquierdo, Victoria De Juan, Guadalupe Rodriguez, and Itziar Fernandez. "Repeatability and reproducibility of Orbscan II." Optometry Reports 2, no. 1 (January 30, 2012): 1. http://dx.doi.org/10.4081/optometry.2012.e1.

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This study aimed to determine the repeatability and reproducibility of Orbscan for anterior and posterior best fit sphere (BFS), simulated keratometry (Sim-K), and central (CCT) and mid-peripheral (PCT) corneal thickness measurements in healthy eyes. Orbscan was performed in 40 healthy eyes (20 subjects) three consecutive times on each cornea during three visits scheduled over one week. Repeatability and reproducibility coefficients [Bland and Altman’s coefficient (BAC), coefficient of variation (CV) and intraclass correlation (ICC)] were calculated for Orbscan anterior and posterior BFS, Sim-K and corneal pachymetry (central, superior, inferior, nasal and temporal locations). Repeatability was calculated using three consecutive measurements during each visit, while reproducibility was calculated using the average of the measurements obtained at each visit. High repeatability was found for all Orbscan measurements (r2<0.01; P>0.05, two-way ANOVA) with BAC and CV <1% (except in PCT coefficients; from 0.97% to 1.67%) and ICC close to 0.98- 0.99 for all visits. High reproducibility was also found for all Orbscan measurements (r2<0.01; P>0.05 two-way ANOVA). BAC values were less than 1% for both BFS and Sim- K, and between 1.21 and 2.20% for corneal pachymetry. CV values were less than 1% (except in superior, nasal and temporal PCT, where they ranged from 1.06 to 1.30%). ICC was close to 0.98-0.99 for all measurements. The BAC of reproducibility was higher than the CV of reproducibility. PCT showed less repeatability and reproducibility than CCT. The Orbscan provides non-invasive, repeatable and reproducible measurements of anterior and posterior BFS, simulated keratometry. and central and mid-peripheral pachymetry in healthy eyes.

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Taneri, Suphi, Samuel Arba-Mosquera, Anika Rost, Saskia Kießler, and H. Burkhard Dick. "Repeatability and reproducibility of manifest refraction." Journal of Cataract and Refractive Surgery 46, no. 12 (December 2020): 1659–66. http://dx.doi.org/10.1097/j.jcrs.0000000000000343.

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Alberink, Ivo, and Arnout Ruifrok. "Repeatability and Reproducibility of Earprint Acquisition." Journal of Forensic Sciences 53, no. 2 (March 2008): 325–30. http://dx.doi.org/10.1111/j.1556-4029.2008.00663.x.

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Feitelson, Dror G. "From Repeatability to Reproducibility and Corroboration." ACM SIGOPS Operating Systems Review 49, no. 1 (January 20, 2015): 3–11. http://dx.doi.org/10.1145/2723872.2723875.

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Mandel, John, and Theodore W. Lashof. "The Nature of Repeatability and Reproducibility." Journal of Quality Technology 19, no. 1 (January 1987): 29–36. http://dx.doi.org/10.1080/00224065.1987.11979030.

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Halligan, S. "Reproducibility, repeatability, correlation and measurement error." British Journal of Radiology 75, no. 890 (February 2002): 193–94. http://dx.doi.org/10.1259/bjr.75.890.750193.

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Karpinsk, K. F. "Reliability of Repeatability and Reproducibility Measures in Collaborative Trials." Journal of AOAC INTERNATIONAL 72, no. 6 (November 1, 1989): 931–35. http://dx.doi.org/10.1093/jaoac/72.6.931.

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Abstract The acceptability of a new analytical method is generally assessed in terms of repeatability and reproducibility estimates derived from a collaborative study. Procedures are presented for calculating confidence intervals and operating characteristic curves for acceptance criteria based on the repeatability and reproducibility estimates. Comparisons of the reliability of estimates are provided for various numbers of collaborators. With a small number of collaborators, the estimates of reproducibility are not reliable and decisions regarding acceptability of a method will be heavily based on the method’s repeatability rather than the property of most interest, namely, the reproducibility of the method.

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Tilt, Nicola, and Martin A. Hamilton. "Repeatability and Reproducibility of Germicide Tests: A Literature Review." Journal of AOAC INTERNATIONAL 82, no. 2 (March 1, 1999): 384–89. http://dx.doi.org/10.1093/jaoac/82.2.384.

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Abstract The results of a quantitative antimicrobial assay can be summarized by the log reduction value. For an assay to be proposed as a standard method, it is usually necessary to conduct a collaborative study to demonstrate that the repeatability and reproducibility standard deviations (SDs) of the log reduction values are sufficiently small. It is not clear, however, precisely how small those SDs should be. This paper describes the results of a literature review conducted to determine the range of repeatability and reproducibility SDs for standard quantitative antimicrobial assays. The underlying premise is that, for an assay to have been accepted as a standard method, its repeatability and reproducibility SDs must have been sufficiently small. This premise implies that the repeatability and reproducibility SDs of standard assays establish de facto guidelines for acceptability. The survey comprised papers where the SDs could be extracted directly or where they could be calculated from accessible data. Papers describing suspension tests as well as hard surface tests were included. For the standard antimicrobial assays reviewed, repeatability SDs ranged from 0.25 to 1.21 and the reproducibility SDs ranged from 0.31 to 1.54.

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Kola, Mehmet, Hikmet Duran, Adem Turk, Suleyman Mollamehmetoglu, Ahmet Kalkisim, and Hidayet Erdol. "Evaluation of the Repeatability and the Reproducibility of AL-Scan Measurements Obtained by Residents." Journal of Ophthalmology 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/739652.

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Purpose. To assess the repeatability and reproducibility of ocular biometry and intraocular lens (IOL) power measurements obtained by ophthalmology residents using an AL-Scan device, a novel optical biometer.Methods. Two ophthalmology residents were instructed regarding the AL-Scan device. Both performed ocular biometry and IOL power measurements using AL-Scan, three times on each of 128 eyes, independently of one another. Corneal keratometry readings, horizontal iris width, central corneal thickness, anterior chamber depth, pupil size, and axial length values measured by both residents were recorded together with IOL power values calculated on the basis of four different IOL calculation formulas (SRK/T, Holladay, and HofferQ). Repeatability and reproducibility of the measurements obtained were analyzed using the intraclass correlation coefficient (ICC).Results. Repeatability (ICC, 0.872-0.999 for resident 1 versus 0.905-0.999 for resident 2) and reproducibility (ICC, 0.916-0.999) were high for all biometric measurements. Repeatability (ICC, 0.981-0.983 for resident 1 versus 0.995-0.996 for resident 2) and reproducibility were also high for all IOL power measurements (ICC, 0.996 for all).Conclusions. The AL-Scan device exhibits good repeatability and reproducibility in all biometric measurements and IOL power calculations, independent of the operator concerned.

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Jing, Gary G. "How to measure test repeatability when stability and constant variance are not observed." International Journal of Metrology and Quality Engineering 9 (2018): 10. http://dx.doi.org/10.1051/ijmqe/2018007.

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Passive intermodulation (PIM) is a critical measurement for radio frequency (RF) communication networks. Yet PIM measurement inherently has very poor repeatability, which makes product assessment unreliable. The RF industry struggles with the issue since there are no known solutions. With the increasing demand for low-PIM performance, there are pressing demands to address the challenge. Two fundamental problems make traditional gage R&R study invalid for PIM: (1) PIM in nature is unstable and unrepeatable; (2) PIM measurement has inherently inconstant variance at different PIM levels, which is primarily due to limited capability of PIM analyzer. This resulted in several less-known issues significantly impacting the estimation of PIM test repeatability, including sample selection, one-sided spec and differences between test R&R and gage R&R. The paper proposed two fundamental changes when studying R&R of PIM test or tests in general violating constant variance assumptions: (1) sample selection; (2) what measurement to use to better estimate and represent the test repeatability. Special sampling is proposed to minimize the impact of inconstant variance. A more direct R&R measurement, margin of error (MOE), also known as study variation, is proposed to replace traditional gage R&R metrics to more meaningfully represent PIM test R&R. Several statistically based techniques to improve the repeatability and reliability of PIM measurement are also discussed. The study and proposed solutions apply to not only PIM test but also tests in general violating constant variance assumptions.

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McClure, Foster D., and Jung-Keun Lee. "Procedures for Estimating Confidence Intervals for Selected Method Performance Parameters." Journal of AOAC INTERNATIONAL 84, no. 3 (May 1, 2001): 940–46. http://dx.doi.org/10.1093/jaoac/84.3.940.

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Abstract Procedures for estimating confidence intervals (CIs) for the repeatability variance (σr2), reproducibility variance (σR2 = σL2 + σr2), laboratory component (σL2), and their corresponding standard deviations σr, σR, and σL, respectively, are presented. In addition, CIs for the ratio of the repeatability component to the reproducibility variance (σr2/σR2) and the ratio of the laboratory component to the reproducibility variance (σL2/σR2) are also presented.

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Kimble, Rachel, Karen M. Keane, John K. Lodge, and Glyn Howatson. "Methodological Considerations for a Vascular Function Test Battery." International Journal of Sports Medicine 40, no. 09 (July 15, 2019): 601–8. http://dx.doi.org/10.1055/a-0946-1293.

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AbstractThere is a dearth of information regarding the reliability of non-invasive measures of vascular function taken in a single testing session. This study aimed to determine the test-retest reliability of a test battery of vascular function measures: automated blood pressure (BP), laser Doppler imaging with iontophoresis (LDI), digital volume pulse (DVP), pulse wave velocity (PWV), augmentation index (AIx) measured by pulse wave analysis (PWA) and flow-mediated dilation (FMD) taken within and between sessions. Measures were taken in 21 non-smoking males intra-session and again inter-session (one week apart) to determine repeatability and reproducibility, respectively. There was moderate to excellent repeatability (ICC: 0.53–0.93; CV=2.2–18.1%) and reproducibility (ICC: 0.71–0.96; CV 1.9–14.2%) for BP, DVP stiffness index, PWV, AIx, AIx normalised to heart rate (75 bpm), absolute and percentage FMD. Repeatability of the DVP reflection index was moderate (ICC: 0.64; CV=9.5%) but there was poor reproducibility (ICC: 0.17; CV=15.1%). Moreover, the repeatability and reproducibility of the LDI measures ranged from poor to good (ICC: 0.31–0.84; CV=28.4–36.7%). These data indicated that there was considerable variability in the repeatability and reproducibility of measurements of endothelial function and arterial stiffness taken in a battery of measurements, which needs careful consideration in future research designs.

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Rocha, Sergio, Vivek Tandon, and Soheil Nazarian. "Falling Weight Deflectometer Fleet Repeatability and Reproducibility." Road Materials and Pavement Design 5, no. 2 (June 30, 2004): 215–38. http://dx.doi.org/10.3166/rmpd.5.215-238.

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Boboridis, K. "Repeatability and reproducibility of upper eyelid measurements." British Journal of Ophthalmology 85, no. 1 (January 1, 2001): 99–101. http://dx.doi.org/10.1136/bjo.85.1.99.

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Perches, Sara, M. Victoria Collados, and Jorge Ares. "Repeatability and Reproducibility of Virtual Subjective Refraction." Optometry and Vision Science 93, no. 10 (October 2016): 1243–53. http://dx.doi.org/10.1097/opx.0000000000000923.

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Franks, John R., William J. Murphy, and Stephen D. Simon. "Repeatability and reproducibility in hearing protector testing." Journal of the Acoustical Society of America 99, no. 4 (April 1996): 2464–500. http://dx.doi.org/10.1121/1.415505.

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Petersen, DR, RE Link, and J. Mandel. "Repeatability and Reproducibility for Pass/Fail Data." Journal of Testing and Evaluation 25, no. 2 (1997): 151. http://dx.doi.org/10.1520/jte11472j.

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Hamaker, H. C. "A Statistician’s Approach to Repeatability and Reproducibility." Journal of AOAC INTERNATIONAL 69, no. 3 (May 1, 1986): 417–28. http://dx.doi.org/10.1093/jaoac/69.3.417.

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Abstract Repeatability and reproducibility are 2 concepts jointly describing the precision of tests performed according to some standard test method. The statistical principles underlying these concepts are explained in Fart I. In Part II, these principles are applied to the design, statistical analysis, and interpretation of collaborative, or interlaboratory, studies especially organized for finding numerical estimates, sr and sR, of the repeatability and reproducibility standard deviations, σr and σR.

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LoVerde, John, and Wayland Dong. "Repeatability and reproducibility concepts in acoustical laboratories." Journal of the Acoustical Society of America 130, no. 4 (October 2011): 2355. http://dx.doi.org/10.1121/1.3654436.

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Yu, Ayong, Weiqi Zhao, Giacomo Savini, Zixu Huang, Fangjun Bao, Weicong Lu, Qinmei Wang, and Jinhai Huang. "Evaluation of Central Corneal Thickness Using Corneal Dynamic Scheimpflug Analyzer Corvis ST and Comparison with Pentacam Rotating Scheimpflug System and Ultrasound Pachymetry in Normal Eyes." Journal of Ophthalmology 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/767012.

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Purpose.To assess the repeatability and reproducibility of central corneal thickness (CCT) measurements by corneal dynamic Scheimpflug analyzer Corvis ST in normal eyes and compare the agreement with Pentacam rotating Scheimpflug System and ultrasound pachymetry.Methods.84 right eyes underwent Corvis ST measurements performed by two operators. The test-retest repeatability (TRT), within-subject coefficient of variation (CoV), and intraclass correlation coefficient (ICC) were used to evaluate the intraoperator repeatability and interoperator reproducibility. CCT measurements also were obtained from Pentacam and ultrasound pachymetry by the first operator. The agreement between the three devices was evaluated with 95% limits of agreement (LoA) and Bland-Altman plots.Results.Corvis ST showed high repeatability as indicated by TRT ≤ 13.0 μm, CoV < 0.9%, and ICC > 0.97. The interoperator reproducibility was also excellent. The CoV was <0.9%, and ICC was >0.97. Corvis ST showed significantly lower values than Pentacam and ultrasound pachymetry (P<0.001). The 95% LoA between Corvis ST and Pentacam or ultrasound pachymetry were −15.8 to 9.5 μm and −27.9 to 12.3 μm, respectively.Conclusions.Corvis ST showed excellent repeatability and interoperator reproducibility of CCT measurements in normal eyes. Corvis ST is interchangeable with Pentacam but not with ultrasound pachymetry.

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Journal articles on the topic 'Gage repeatability and reproducibility'

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