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Dissertations / Theses on the topic 'Chyby měření'
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1
Uríča, Jozef. "Chyby v MRI metodách měření difúzních koeficientů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218553.
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Diploma thesis Errors in MRI methods for measuring diffusion coefficients a study of measurement of diffusion NMR methods, specifies the location, causes, origination diffusion coefficients. The main function of the program is to simulate changes parameters measurement of diffusion coefficients and allows for example only one gradient or runs down gradient pulses.
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Januš, Petr. "Nejistoty měření dynamické viskozity." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219808.
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The thesis is deal with measuring the temperature dependence of dynamic viscosity and the calculation of measurement uncertainties. The thesis writes up the physical nature of viscosity and rheological properties. Next it is write up an overview of possible methods for measuring viscosity of liquids and overview of methods for measuring the density of liquids. An important chapter is the statistical evaluation of measured data represented mainly measurement uncertainties. In the practical part of the work is done workplace for measure the temperature dependence of dynamic viscosity. It is used two methods of measuring viscosity of liquids and two samples of liquids. Finally is done statistical evaluations of measurement. Based on the calculated measurement uncertainty measurement methods are compared.
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Háněl, Petr. "Měření frekvenční stability oscilátorů v časové oblasti." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220360.
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The thesis focuses on measurements of oscillators’ frequency stability. The theoretical part describes the basic concepts of measurement of frequency, measuring systems and measurement errors. The second part of thesis describes the design of measurement system. The design contains all data for build prototype and software, including all source codes.
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Schwarz, Jakub. "Kalibrace tlakoměrů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231426.
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This diploma thesis is dealing with pressure measurement. It describes instruments dedicated to purpose - pressure gauges. Basic of correct pressure measurement is knowledge of behaviour of used pressure gauge. This knowledge is acquired by calibration. With calibration is associated also analysis of errors and uncertainty of measurement and creation of calibration list. Calibration takes place on model workspace pressure measuring in laboratory.
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Boštík, Ondřej. "Koaxiální multiplexer pro automatizované měření AC proudu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-240832.
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Master’s thesis in the theoretical part deals with literature review on the topic of measurement errors and measurement uncertainties. The practical part deals with the simulation of additional capacitive and resistive load on the amplitude and phase error during shunts based measurement. For this simulation is used mathematical apparatus of cascade matrix of two-ports and their connections. For the actual simulation is used script for MATLAB. Furthermore, the work deals with the design of voltage follower to eliminate simulated errors and its practical realization. The last part deals with the design of the coaxial multiplexer for switching current shunts developed in the Czech Metrological Institute in Brno.
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Pokorný, Zdeněk. "Zpracování dat z měření na obráběcích strojích." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382195.
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The Master’s thesis deals with the precision of machine tools, especially with the three-axis vertical milling machine. It is structurally divided into a theoretical and practical part. While the theoretical part focuses on problems of geometric errors and measuring devices, the practical one is devoted to the machine tool being tested. In this case, the data processing and the proposed statistical analysis are essential, and at the end of the thesis another possible way of developing the data processing is outlined.
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Sobotková, Kateřina. "Zvýšení efektivity kontroly ramene tankovací nádrže." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401062.
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The diploma thesis consists of a new design of a controlling procedure for a plastic component of a tank. Its theoretical part deals with the potential sources of errors and uncertainties arising from the measuring itself. It also deals with the characteristics of available CMM devices and includes an analysis of the methods assessing the acceptability of the measurement plan. The practical part analyses systematically the current state and proposes a new solution using a program created using a coordinate machine. A comparison of both variants is presented as an output of the thesis.
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Zimek, Alois. "Snímače střídavého a stejnosměrného proudu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217921.
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The aim of this master’s thesis is to focus on analysis of a current transformer with feedback correction of measuring error, make an AC current sensor and verify its qualities experimentally. The measuring scale of this transformer is I = 0 to 100A, f = 50Hz.
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Dvořáček, Petr. "Evoluční návrh pro aproximaci obvodů." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2015. http://www.nusl.cz/ntk/nusl-234958.
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In recent years, there has been a strong need for the design of integrated circuits showing low power consumption. It is possible to create intentionally approximate circuits which don't fully implement the specified logic behaviour, but exhibit improvements in term of area, delay and power consumption. These circuits can be used in many error resilient applications, especially in signal and image processing, computer graphics, computer vision and machine learning. This work describes an evolutionary approach to approximate design of arithmetic circuits and other more complex systems. This text presents a parallel calculation of a fitness function. The proposed method accelerated evaluation of 8-bit approximate multiplier 170 times in comparison with the common version. Evolved approximate circuits were used in different types of edge detectors.
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Bárta, Tomáš. "Nastavování resolveru, odhalování chyb na jednu otáčku a jejich praktické měření." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242129.
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The goal of this thesis is create measuring station of resolver with using Analog Devices AD2S1210. The measuring station is based on the Atmel ATmega16 microprocesor and programmed in the C language. The measuring plant of resolvers to detection fault per one revolution is developed with industrial cooperation. The measuring station is made for a mobile use with onboard Pb accu. Measuring station will be used as a service device or in the manufacturing for setting the right angle of resolver on the engine. For the faults debugging of resolvers cables and other faults with the signal chain between the resolver and AD2S1210 is possible to show the SIN and COS signals on the external scope.
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Slavíček, Josef. "Měření vřeten obráběcích strojů pomocí bezkontaktních snímačů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230490.
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The goal of this work is to propose a suitable methodology for measuring and evaluating the geometric precision of spindle rotation. Identification and classification of errors while moving spindle. Part of this work should be also a program in LabVIEW that evaluate the errors in the motion of the spindle. Practical functionality of the proposed measurement system should be tested at selected MCV754 QUICK machines, lathes SV 18 and milling machine FNG 32. For processing of the results should be used basic statistical procedures. This thesis includes research in the field of machine tool spindles and different ways of measuring spindle motion deviations from the ideal path. There is also included the effect of sensors to measuring spindle running accuracy and identification of suitable sensors applicable for this application. There is a proposal of measurement of selected machinery, and defines all the components required for measurements that were used during spindle running precision measurement. Part of this work is a basic description of the program developed for evaluating errors in the motion of the spindle.
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Fišr, Petr. "Analýza nejistot nepřímých měření." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229059.
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This diploma thesis is engaged with problems of expressing measurement uncertainty especially for indirect measurements. This issue is shown here on a few simple examples. Part of this work is a calculation module for the determination of measurement uncertainties, applied to the role of the laboratory 'measurement of the flow orifice.
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Juřica, Lukáš. "Automatické měření odstupu motorových vozidel." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218403.
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This work deals with evaluation of equipment used for non-contact measurement of distance between vehicles. First are discussed various principles of measuring and after the selection of the most appropriate solution is proposed a detailed block diagram of modulation, demodulation and evaluation of the whole system and its mathematical description. Another part is devoted to describing the activities of the microprocessor controller, with which is controlled evaluation part and to the control program. It also analyzes the maximal attainable accuracy of measurement and the errors that affect it. The last part includes a circuit design and simulation of selected functional block, which is a coincidence /quadrature/ detector and construction documents for evaluation and demodulation part of the measurement instrument.
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Toman, Josef. "Zařízení pro měření výškové polohy těžiště vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231246.
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This diploma thesis deals with measurement of vehicle centre of gravity height position. In the first part is created summary of methods used for measuring centre of gravity position and moment of inertia of the vehicle. In the other parts are designed and analyzed two dynamics method of measuring centre of gravity height position. This thesis presents analysis of the errors of the proposed methods, results of measurements and design of the construct adjustments device for measuring of the moments of inertia enabling its used for measuring centre of gravity height position. Some components are through analyse of tension.
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Kiška, Roman. "Stanovení přesnosti měření souřadnicového měřicího stroje Zeiss UPMC Carat." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-442852.
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The aim of this diploma thesis is to create a comprehensive study of measurement accuracy of coordinate measuring machine (hereinafter CMM) Zeiss UPMC 850 Carat S-ACC (hereinafter Zeiss Carat) for the needs of the national metrological institute in Brno in accordance with ČSN EN ISO / IEC 17025 and the follow-up system standards of the ČSN EN ISO 10360 series. Additionally, it includes the creation of instructions for the calculation of measurement uncertainty, which will be put into effect in an accredited calibration laboratory. The first part of the work focuses on the description of the current state of knowledge and the definition of basic concepts in the field of metrology and accurate measurements on CMM. The second part describes the Zeiss Carat measuring machine, identifies the individual contributors to the resulting measurement uncertainty and defines the methodology for their quantification. The last part deals with the evaluation of calibration data and the calculation of the expanded measurement uncertainty of the Zeiss Carat instrument, which is used to quantify its accuracy.
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Zbránek, Jakub. "Měření horizontálních a vertikálních posunů gabionové zdi." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226754.
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The main subject of this diploma thesis is monitoring of horizontal and vertical displacements of the supporting wall in village Smědčice. The thesis describes the whole production process, from construction of the reference net and the net of observed points to the final review. There are also displayed main theoretical basis. Final outputs of the thesis are charts, graphical sketches, tables and final word summary.
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Novotný, Petr. "Analýza kontroly klopného momentu axiálního táhla řízení." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229262.
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Work smoothing - out evaluation accuracy of measurement monostable moment steering linkage by the help of special machine. Evaluates individual characteristics accuracy, especially uncertainty metering.
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Peňák, Martin. "Minimalizace chyb v procesu obrábění s ohledem na operátora." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232170.
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This thesis deals with analysis of measurement system capability in the production of rotary components from the viewpoint of operator error reduction and reliability of human factors. The aim is to carry out a literature review on the topic and then to analyze the current system in the company ZNOJEMSKÉ STROJÍRNY, s.r.o. Based on the obtained data suggest appropriate corrective arrangements to improve the current situation.
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Šrámek, Jan. "Vyjadřování nejistoty u přesných délkových měření II." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229763.
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This diploma thesis is supposed to inform readers interested in the distance measurements uncertainty on practical issues connected with the solving of these troubles when utilising a frequently used calibration method - the Tesa NPL measure instrument. This measuring was implemented by the Czech Metrologic Institute, where the author works; therefore he could take advantage of his rich experience as well as experience of his superiors and colleagues. The author regards the national metrological institute (CMI) as a sufficient guarantee for the hereinafter presented materials, both regarding the professional qualification and from the perspective of formal rightness of this thesis.
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Sekér, Roman. "Vyjadřování nejistot při kalibraci měřidel." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229255.
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Čurda, Pavel. "Měřicí přístroj HDO signálů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-400610.
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The thesis deals with the introduction of the measuring instrument SVA - M on the market for compliance with electromagnetic compatibility and electrical safety requirements. Furthermore it deals with determination of measuring accuracy instrument SVA - M and measurement uncertainties. For the determination of accuracy there is a theoretical analysis and subsequent practical measurements.
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Vykoukal, Tomáš. "Měřicí transformátor proudu 2500/1 A pro soustavy s nejvyšším napětím 0,72 kV." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-399564.
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This thesis deals with the description, analysis, calculation, production and testing of current instrument transformer. It is a measuring current transformer in one turn primary winding with 2500/1 A transfer. This project includes theory, analysis, numerical calculation, thermal simulation and partial type test of the measuring current transformer. This transformer is developing in cooperation with KPB Intra s.r.o. KPB Intra is engaged in the development and production of instrument transformers.
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Frank, Petr. "Metodika zabezpečování optimální přesnosti měření v souladu s metrologickou konfirmací." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-233462.
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This thesis deals with the evaluation of accuracy of measurement and achieving the required accuracy level. This includes global analysis of the uncertainty evaluation, the calibration interval design and the creation of confirmation system. Basis of this work is in identification of all possible problems, which may occur during evaluation of accuracy and achieving the required accuracy level. The analysis is followed by suggested solutions for identified problems. It means namely the selection of probability distribution in case of uncertainty type A, evaluation of degrees of freedom in case of uncertainty type B, nonlinear correlation of input values, evaluation of coverage factor, the choice of method for calibration interval design and the procedure for meeting all metrological confirmation requirements. The last part of the thesis is practical measurement and result evaluation in the field of surge protection devices. This chapter demonstrates conclusions from the syntactical part.
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Schulz, Roman. "Algoritmy pro zjednodušování modelů." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2008. http://www.nusl.cz/ntk/nusl-235967.
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VYSOKÉ UČENÍ TECHNICKÉ V BRNĚ The purpose of this work is to design and implement a computer system, which should be used for simplification of a polygonal models in 3D space. The system should be allowed to reduce a given number of geometrical primitives from source object. User should have impact to the reducing process by selecting a method, size of target object etc. System uses 3DS file format for model loading and saving. Reader should understand principles of the polygon reduction and used algorithms.
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Šumberák, David. "Přístrojový transformátor proudu 12kV, 4000//5/5A." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220954.
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This master´s thesis describes the development proposal and production of instrument current transformer in one turn primary winding with 4000//5/5 A transfer. The thesis involves a theoretical analysis, a numerical calculation, a developmental 3D model, corresponding simulations and a standard testing of the transformers. There is a complete written description of measuring current transformer cycle from the development to the production. The transformer development and production works were collaborated with the company KPB Intra s.r.o. The company engages in development, production and sale of these kinds of instrument transformers in the Czech Republic and foreign markets.
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Jašek, Filip. "Systém pro záznam a hlášení chybových stavů chladicích zařízení." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2021. http://www.nusl.cz/ntk/nusl-445585.
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The thesis deals with the design and creation of a system for recording and reporting error states of cooling devices on the principle of a compressor heat pump. An important element of the concept of the entire monitoring system is a built-in platform based on the ESP32 microcontroller for evaluating data measured by sensors. Another key element is the communication module, which sends measured data via GPRS in the form of MQTT messages to the service web application. The application receives, evaluates and records measured data. Subsequently are measured data and evaluated error states presented to the user in the form of tables and interactive graphs.
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Šimoník, Petr. "Měřič odstupu signálu od šumu obrazových signálů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217681.
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The diplomma thesis is dealing with possibilities of Signal to noise ratio measurement by method, which is based on direct measurement. It is chosen the most suitable method – signal and noise separation to two different parallel signal branches, where is measured signal strength in one branch and root mean square value in the other. The thesis is consisted of a concept of detail block scheme of Signal to noise ratio meter, which was designed in terms of theoretical knowledge. Particular functional blocks were circuit-designed, the active and passive parts were chosen and their function were described. There were made simulation and displayed input and output time flows. There is designed the whole connection of engineered Signal to noise ratio meter in the last part of my thesis. The double-sided board of printed circuit is contained too. It was created simple programme for supervisor micro-processor. Thereby were constructed complete bases for realization.
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Fujdiak, Radek. "Analýza a optimalizace datové komunikace pro telemetrické systémy v energetice." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-358408.
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Telemetry system, Optimisation, Sensoric networks, Smart Grid, Internet of Things, Sensors, Information security, Cryptography, Cryptography algorithms, Cryptosystem, Confidentiality, Integrity, Authentication, Data freshness, Non-Repudiation.
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Antoňová, Tereza. "Detekce chyby měření pomocí reakčního času." Master's thesis, 2017. http://www.nusl.cz/ntk/nusl-357681.
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The diploma thesis deals with the detection of measurement error based on the question order using the reaction time. The major part of the theoretical chapter deals with the respondent as the source of the error. A respondent needs to proceed through a cognitive process to answer a question. Various influences affect the process and they might have an effect on the accuracy of the answer. The frequently mentioned effects are age, education and motivation of respondent. The absence of respondents' motivation might lead to a reduction of their effort to properly proceed with the cognitive process. In that case, the respondent does not dedicate the appropriate cognitive effort and time to a question in the questionnaire. That length of time, which the respondent takes to answer, is called the reaction time and it is suggested that it might be used as an indicator of the amount of cognitive effort. Based on previously executed studies, the author designed hypotheses about the change in length of the reaction time with a change of question position in a questionnaire, about the effect of respondents' characteristics on the reaction time and its shortening. The significant shortening of the reaction time on the question located closer to the end of the experimental questionnaire is used as an indicator...
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Ptáček, Tomáš. "Chyby a opravy měření atmosférických srážek." Master's thesis, 2012. http://www.nusl.cz/ntk/nusl-308181.
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The thesis approaches the problem of systematic errors that arise in measuring precipitation. These errors lead to underestimation of total rainfall. Size of losses can reach in our latitudes even tens of percent. The systematic errors that contribute most to the underestimation include losses caused by the rain gauge walls wetting, evaporation losses and losses due to aerodynamic effects on the rain gauge precipitation particles. A major section of the thesis is formed by background research, which deals with the issue of systematic measurement errors precipitation. The background research tackles the lack of literature on this topic in the Czech Republic. In the research section of the thesis, two existing correction methods for estimating the size of systematic errors for the Czechoslovak manual rain gauge Metra (method developed in the 80's by Slovak Hydrometeorological Institute and the method described by the dissertation thesis Radoslav Tihlárik) were applied to data of selected four stations in the Czech Republic (Milešovka, Bedřichov - Přehrada, Čáslav - Nové Město and Svratouch) . The first mentioned method was applied to all stations in the Slovak Republic in the nineties. Nevertheless, it has not been used in the Czech Republic so far. The results show that the Tihlárik method gives...
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Kohout, Pavel. "Chyby měření v průzkumu trhu a sociologickém výzkumu." Master's thesis, 2006. http://www.nusl.cz/ntk/nusl-268220.
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The text being offered is methodological micro-tribute to the theory of market reserarch, sociological surveys and opinion polling. It analyses results of already evaluated empirical examinations about the nature of interviewing and measurement error streaming from this source. The results are discussed and completed by authors empirical experience gained in full service market research agency on both domestic and international projects. We are able to measure sampling error or, as some researchers say, errors of non-observation, but we have serious doubts about measurement and prevention of those arising in the datacollection phase. Those errors negatively affect the quality of survey results. Whether it is respondents reactions, interviewer tactics or non-respose phenomena, we are not able to foresay its volume and direction in advance. Partially, bacause those effects are interreacting. Results of sociological survey are uneasy to be generalised because of impossibility to compare data collected in diferent cultural, historical and political surroundings. The text aims to define survey quality rather in a way what it is not. The conclusions of the analyses show that it is safer to rely on prevention of the errors rather than on subsequent data processing. Also, validity and reliability schemes must be...
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Chylíková, Johana. "Citlivé otázky a chyby měření v dotazníkových šetřeních." Master's thesis, 2011. http://www.nusl.cz/ntk/nusl-298580.
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The thesis presents available theoretical basis for examination of sensitive issues in sociology and draws attention to measurement errors in sociological surveys. Further the analysis of discrepancy in respondents' reports of number of lifetime sexual partner is conducted. For the purpose of the analysis the data from Survey of sexual behavior, accomplished by prof. Petr Weiss, PhD. and docent Jaroslav Zvěřina CSc. in 1993, 1998, 2003 and 2008, is employed. The text summarizes available explanations of discrepancy, which are further used for clarification of an incongruity in the data from Czech republic. First an outline of the means of number of lifetime sexual partners for men and women is presented and a reduction of the dataset by extreme values is implemented. The analysis deals with effects of commercial sex on the discrepancy, detects whether men and women respond differently on other sensitive attributes and reveals whether answer strategies are sex-linked. The dataset of female respondents was used for testing the social desirability hypothesis. Finally the SAQ mode data from Survey of sexual behavior are compared with the outputs of the face-to-face interview mode survey.
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MITTASCH, Marek. "Výukový text pro úvodní fyzikální praktikum." Master's thesis, 2012. http://www.nusl.cz/ntk/nusl-136447.
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The diploma thesis presents basic concepts of measuring, physical quantities, units of measurement and Physics instruments. There are instructions how to realize the measuring in practice and an introduction of measuring deviation. There are examples showing processing of measured values including use of some Microsoft Excel functions.
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Přibáňová, Tereza. "Validizace Marlowe-Crowne škály sociální desirability v českém prostředí." Master's thesis, 2014. http://www.nusl.cz/ntk/nusl-338746.
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Diploma thesis deals with the process of validization of Marlowe-Crowne social desirability scale in the Czech context. Despite the fact that social desirability represents an error, which can disrupt validity of obtained data, there is no official Czech version of Marlowe-Crowne scale that could be used in surveys. The aim of this thesis is to create Czech translation of the scale and test its functionality. The Marlowe-Crowne scale is introduced from a theoretical point of view firstly, is discussed its creation, characteristics, its importance in relation to social desirability, critics and problems and possibilities and difficulties of its use in the new context. Further are discussed different ways of translation of research instruments, which could help to preserve their purpose, and method of cognitive interviews as a way of testing of new or adapted research instruments. Modified parallel translation of three translators was used for creation of Czech version of Marlowe-Crowne scale. Cognitive interview, based mostly on verbal protocols, were used for testing of finally translated scale to find out, if scale is applicable in the Czech context without any problems. Interviews were conducted with sixteen respondents with different sociodemographic characteristics. Thesis concludes that scale...
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Navrátil, Radim. "Testy statistických hypotéz za přítomnosti chyb měření." Doctoral thesis, 2014. http://www.nusl.cz/ntk/nusl-332344.
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The behavior of rank procedures in measurement error models was studied - if tests and estimates stay valid and applicable when there are some measurement errors involved and if not how to modify these procedures to be able to do some statistical inference. A new rank test for the slope parameter in regression model based on minimum distance esti- mator and an aligned rank test for an intercept were proposed. The (asymptotic) bias of R-estimator in measurement error model was also investigated. Besides measurement errors the problem of heteroscedastic model errors was considered - regression rank score tests of heteroscedasticity with nuisance regression and tests of regression with nuisance heterosce- dasticity were proposed. Finally, in location model tests and estimates of shift parameter for various measurement errors were studied. All the results were derived theoretically and then demonstrated numerically with examples or simulations.
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Chylíková, Johana. "Analytické metody odhadu chyb měření v datech z výběrových šetření." Doctoral thesis, 2017. http://www.nusl.cz/ntk/nusl-353506.
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Analytical methods for measurement error estimation in survey data This dissertation aims at the domain of measurement error in social science survey data. To conceptualize and estimate measurement errors it employs the analytical and theoretical framework that stems from the analytical method of structural equation modeling (SEM) and Classical Test Theory (CTT), extended with the component of the systematic measurement error. This thesis has two goals that may contribute to development and extension of Czech social science methodology. The first goal is to illustrate methods of measurement error estimation, which has not been used for analysis of Czech data yet, and to point out to some problematical aspects of these methods. The second goal is to employ presented methods to obtain new findings regarding the quality of data from Czech surveys. The dissertation presents three empirical studies, each of which uses one of the methods defined within the presented theoretical and analytical framework. First study presents an analysis of reliability of measurement with the Quasi Simplex Model (QSM). It illustrates how to use the model and brings optimistic results regarding the reliability of the Czech EU SILC panel data. In the second study the confirmatory factor analysis model, operationally called...
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Drábková, Alena. "Vliv chyb měření na tvar regresní funkce v nelineárním modelu." Master's thesis, 2010. http://www.nusl.cz/ntk/nusl-282030.
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In this thesis we study the effect of regressors measured with an error on an estimated coefficients in a generalized linear model. We infer the true shape of the mean and of the variance function in the given model. We show that assumptions of a generalized linear model are not fulfilled universally if we use variables measured with an error. Despite this, the error-in-variable model can still be useful for testing dependence of original correct regressor. Further on in the thesis, the asymptotic values of coefficients are approximated, assuming g(E(Yi|Wi)) is a quadratic function. Examples for all results are provided through simulations.
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Otčenášová, Eliška. "Vliv chyb měření nezávisle proměnných na odhady a testy v regresních modelech." Master's thesis, 2006. http://www.nusl.cz/ntk/nusl-267287.
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The thesis concerns with e ect of covariate measurement error on the least squares estimators and tests of importance of parameters in regression models. It refers to unsatis ed assumptions of linear model when using measurement error covariates and resulting e ect on estimates and tests in regression models. It focuses mainly on investigation of consistence of estimates of linear and quadratic coeficient in additive and multiplicative model with one covariate with homoscedastic and heteroscedastic measurement error. In the nal chapter teoretical results are grounded by simulation study.
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Pešta, Michal. "Moderní asymptotické perspektivy na modelování chyb v měřeních." Doctoral thesis, 2010. http://www.nusl.cz/ntk/nusl-300387.
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A linear regression model, where covariates and a response are subject to errors, is considered in this thesis. For so-called errors-in-variables (EIV) model, suitable error structures are proposed, various unknown parameter estimation techniques are performed, and recent algebraic and statistical results are summarized. An extension of the total least squares (TLS) estimate in the EIV model-the EIV estimate-is invented. Its invariant (with respect to scale) and equivariant (with respect to the covariates' rotation, to the change of covariates direction, and to the interchange of covariates) properties are derived. Moreover, it is shown that the EIV estimate coincides with any unitarily invariant penalizing solution to the EIV problem. It is demonstrated that the asymptotic normality of the EIV estimate is computationally useless for a construction of confidence intervals or hypothesis testing. A proper bootstrap procedure is constructed to overcome such an issue. The validity of the bootstrap technique is proved. A simulation study and a real data example assure of its appropriateness. Strong and uniformly strong mixing errors are taken into account instead of the independent ones. For such a case, the strong consistency and the asymptotic normality of the EIV estimate are shown. Despite of that, their...
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Šarapatková, Anna. "Metodologický pohled na měření (anti)imigračních postojů (kvalita měření se zaměřením na jeho ekvivalenci)." Master's thesis, 2019. http://www.nusl.cz/ntk/nusl-406304.
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Opportunities that we have in today's world are sharply evolving, and the world is changing all together with these changes. This development is noticeably observed within the topic of global movement of (not only) population, which has changed fundamentally, both economically, politically and socially. Today's so much diversified form of migration, which has lost its transparency it used to has, is a very up to date and debated topic currently almost all over the world. Because of high importance of the topic "migration" it is often subject of research and number of surveys. One of the most examined area within the topic migration is attitudes of people towards immigration and immigrant, oftentimes together with investigating cause leading to particular attitude. Due to the international reach of the topic, these attitudes are often subject of cross-national research or national research, which, however, use data from international surveys. There is a clear disparity across European states in these attitudes towards immigration and, above all, the immigrants themselves. Given this nature of cross-national surveys measuring attitudes towards immigrants, it is important to focus on the measurement quality, which is becoming increasingly complex in the perspective of international research. It is...
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Sláčík, Stanislav. "Motion of a body in a fluid with pressure dependent viscosity." Master's thesis, 2013. http://www.nusl.cz/ntk/nusl-324083.
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A lot of technologically relevant incompressible fluids exhibit a substantial variaton of viscosity with the pressure;a falling cylinder viscometer is frequently used for the measurements, determining the viscosity indirectly from the time it takes the sinker to fall a given distance. The relation between the sinker fall velocity and the fluid viscosity is, however, derived under the constant viscosity assumption. The objective of the present thesis is to perform a numerical simulation of the viscometric experiment, assuming an explicit form of the pressure-viscosity dependence and realistic parameter values and to quantitatively assess the difference in body motion to the Navier- Stokes model. The computational method proposed, handling both the nonlinear constitutive relation and the body motion, was tested on simple problems with analytical solutions. The semianalytical relation for the Navier-Stokes model, also re-derived here, is compared to the computational results.The validity of the assumptions used in the theoretical derivation, based on the results of the numerical simulation, is discussed regarding the geometry of the viscometer. Powered by TCPDF (www.tcpdf.org)
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Truong, Phuong Thi. "Vliv pořadí otázek." Master's thesis, 2017. http://www.nusl.cz/ntk/nusl-365535.
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This thesis deals with a methodological phenomenon called order effect. This effect creates a situation where the preceding questions influence answers of the subsequent questions. During cognitive responding process, the preceding questions may evoke specific mental associations and ideas that are more easily accessible afterwards during responding of the following questions. This induced information may be used during answer selection process which may cause bias in answers. The same questions placed in different order can generate different answers. Different question order can have different cognitive burden. The aim of this thesis is cognitive burden assessment of different question orders. Data collection was conducted by cognitive interviews which helped to detect how respondents work with particular questions during questionnaire responding process, and to identify specific types of order effect. There are four types of order effect: carryover effect, backfire effect, assimilation and contrast effect. A specific question preceding a general question evokes information which is more accessible for interpretation of a general question therefore this question order is less burdensome. Also the order from negative to positive question is less burdensome than the opposite order because it evokes...