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Journal articles on the topic 'QML asymptotic results'

Author: Grafiati

Published: 1 June 2024

Last updated: 31 July 2025

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1

Hu, Hongchang. "QML Estimators in Linear Regression Models with Functional Coefficient Autoregressive Processes." Mathematical Problems in Engineering 2010 (2010): 1–30. http://dx.doi.org/10.1155/2010/956907.

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This paper studies a linear regression model, whose errors are functional coefficient autoregressive processes. Firstly, the quasi-maximum likelihood (QML) estimators of some unknown parameters are given. Secondly, under general conditions, the asymptotic properties (existence, consistency, and asymptotic distributions) of the QML estimators are investigated. These results extend those of Maller (2003), White (1959), Brockwell and Davis (1987), and so on. Lastly, the validity and feasibility of the method are illuminated by a simulation example and a real example.

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2

Francq, Christian, and Le Quyen Thieu. "QML INFERENCE FOR VOLATILITY MODELS WITH COVARIATES." Econometric Theory 35, no. 1 (2018): 37–72. http://dx.doi.org/10.1017/s0266466617000512.

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The asymptotic distribution of the Gaussian quasi-maximum likelihood estimator (QMLE) is obtained for a wide class of asymmetric GARCH models with exogenous covariates. The true value of the parameter is not restricted to belong to the interior of the parameter space, which allows us to derive tests for the significance of the parameters. In particular, the relevance of the exogenous variables can be assessed. The results are obtained without assuming that the innovations are independent, which allows conditioning on different information sets. Monte Carlo experiments and applications to finan

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3

Meitz, Mika, and Pentti Saikkonen. "PARAMETER ESTIMATION IN NONLINEAR AR–GARCH MODELS." Econometric Theory 27, no. 6 (2011): 1236–78. http://dx.doi.org/10.1017/s0266466611000041.

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This paper develops an asymptotic estimation theory for nonlinear autoregressive models with conditionally heteroskedastic errors. We consider a general nonlinear autoregression of order p (AR(p)) with the conditional variance specified as a general nonlinear first-order generalized autoregressive conditional heteroskedasticity (GARCH(1,1)) model. We do not require the rescaled errors to be independent, but instead only to form a stationary and ergodic martingale difference sequence. Strong consistency and asymptotic normality of the global Gaussian quasi-maximum likelihood (QML) estimator are

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Francq, Christian, and Jean-Michel Zakoïan. "QML ESTIMATION OF A CLASS OF MULTIVARIATE ASYMMETRIC GARCH MODELS." Econometric Theory 28, no. 1 (2011): 179–206. http://dx.doi.org/10.1017/s0266466611000156.

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We establish the strong consistency and asymptotic normality of the quasi-maximum likelihood estimator (QMLE) of the parameters of a class of multivariate asymmetric generalized autoregressive conditionally heteroskedastic processes, allowing for cross leverage effects. The conditions required to establish the asymptotic properties of the QMLE are mild and coincide with the minimal ones in the univariate case. In particular, no moment assumption is made on the observed process. Instead, we require strict stationarity, for which a necessary and sufficient condition is established. The asymptoti

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Zhang, Mengqi, and Boping Tian. "Profile Maximum Likelihood Estimation of Single-Index Spatial Dynamic Panel Data Model." Mathematics 11, no. 13 (2023): 2947. http://dx.doi.org/10.3390/math11132947.

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In this paper, the spatial dynamic panel data (SDPD) model is extended to the single-index spatial dynamic panel data (Si-SDPD) model by introducing a nonlinear connection function to reflect the interaction between explanatory variables. The Si-SDPD model not only retains the advantages of the parametric SDPD model in dealing with spatial and temporal interaction effects and spatio-temporal dependencies, but also solves the limitations of the parametric SDPD model that may lead to missed bias. It reduces the data dimension of non-parametric models and enhances the practicability and explanato

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Hussein Jasim, Ahmed, Haider Mehdi Moeen, and Ali Hussein Alwan. "Asymptomatic Thyroid dysfunction in patients of chronic renal failure." AL-QADISIYAH MEDICAL JOURNAL 11, no. 19 (2017): 203–10. http://dx.doi.org/10.28922/qmj.2015.11.19.203-210.

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Fifty patients with chronic renal insufficiency underwent clinical evaluation & studies of thyroid function the results were compared with age & sex-matched controls. (20%) of patients had biochemical hypothyroidism with low serum T3, T4, & high serum TSH. All the members of the control group were biochemically euthyroid. The mean values of serum T3, T4 were significantly lower & mean serum TSH was significantly higher as compared to controls. There was no correlation of thyroid functions with decrease in renal function. To conclude thyroid dysfunction occurs both clinically &a

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A. Abbas, Yahya, Adnan H. Aubaid, and Bushra J. Hamad. "Determination of Hepatitis C Viral Load and Genotypes by Real-Time and RT-PCR at Thi_Qar Province." AL-QADISIYAH MEDICAL JOURNAL 9, no. 15 (2017): 250–64. http://dx.doi.org/10.28922/qmj.2013.9.15.250-264.

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The present study was carried out from Sept. 2010 to Jul. 2011 to detect the viral load and genotypes of HCV infections among asymptomatic peoples and patients referred to the central blood bank, center of thalassemia /AL-Haboby Hospital, renal dialysis unit/Al- Hussein Teaching Hospital and public health laboratory at Thi-Qar province. Real-Time Polymerase Chain Reaction Technique (RT-qPCR) was implemented on 90 individuals of anti-HCV seropositive by ELISA III assay. The results revealed that 51(56.66%) were gave positive results for HCV. The RT-qPCR analyses of the positive samples we

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8

B. Alawadi, Najlaa. "Interleukin-6 Level among Iraqi Patients with Chronic Lymphocytic Leukemia from Babil Province." AL-QADISIYAH MEDICAL JOURNAL 12, no. 21 (2017): 113–23. http://dx.doi.org/10.28922/qmj.2016.12.21.113-123.

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Introduction: Interleukin-6 (IL-6) is a pro-inflammatory cytokine and an anti-inflammatory myokine. Chronic lymphocytic leukemia (CLL) is the most common type of leukemia in adults. The exact role of IL-6 in CLL is still contraversial and needs alot of research. Aim of the study: To measure serum level of interleukin-6 among Iraqi patients from Babil province with a newly diagnosed untreated chronic lymphocytic leukemia and to assess it's association with the stage of the disease and peripheral blood indices. Materials and methods: This is a case-control study included 106 Iraqi pa

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9

M., Laktionova, Aringazina A., Kulzhanov M., et al. "CROSS-CULTURAL ADAPTATION OF THE SPECIALIZED QUESTIONNAIRE P-QOL IN RUSSIAN AND KAZAKH FOR WOMEN WITH GENITAL PROLAPSE IN KAZAKHSTAN." Наука и здравоохранение, no. 6(24) (December 31, 2022): 20–25. http://dx.doi.org/10.34689/sh.2022.24.6.003.

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Introduction. The Prolapse Quality of Life (P-QoL) questionnaire is a simple and reliable tool for assessing the severity of genital prolapse symptoms and their impact on women's quality of life. Objective. To adapt and assess the validity, reliability, reproducibility and feasibility of the P-QoL questionnaire for women in Kazakhstan to use it as a tool to assess the severity of symptoms and quality of life of women with genital prolapse, as well as a simple tool for "self-assessment" in women with prolapse. Materials and methods. To assess the understanding of the questions, 20 patients with

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10

Asai, Manabu, and Michael McAleer. "Multivariate Hyper-Rotated GARCH-BEKK." Journal of Time Series Econometrics, January 10, 2022. http://dx.doi.org/10.1515/jtse-2021-0006.

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Abstract For large multivariate models of generalized autoregressive conditional heteroskedasticity (GARCH), it is important to reduce the number of parameters to cope with the ‘curse of dimensionality’. Recently, Laurent, Rombouts and Violante (2014 “Multivariate Rotated ARCH Models” Journal of Econometrics 179: 16–30) developed the rotated multivariate GARCH model, which focuses on the parameters for standardized variables. This paper extends the rotated multivariate GARCH model by considering a hyper-rotation, which uses a more flexible structure for the rotation matrix. The paper shows an

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11

Hu, Jianhua, Hao Ding, and Xiaoqian Liu. "Arbitrage Pricing with Heterogeneous Spatial Effects and Heteroscedastic Disturbances." Journal of Financial Econometrics, February 17, 2022. http://dx.doi.org/10.1093/jjfinec/nbab032.

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Abstract We develop a heterogeneous spatial arbit and regression coefficients, and heteroscedastic variances, and further establish identification of parameters and asymptotic normality of the conditional QML estimators under some mild conditions. We apply the proposed model to study a real data set of 11 eurozone stock index returns and extend the Fama–French five-factor model to regional stock indices, in which heterogeneous spatial effects and heteroscedastic disturbances are highly significant and they both play very important roles in explaining distinct endogenous effects and distinct ri

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12

Slimani, Walid, Ines Lescheb, and Mouloud Cherfaoui. "QMLE for periodic absolute value GARCH models." Random Operators and Stochastic Equations, February 1, 2024. http://dx.doi.org/10.1515/rose-2023-2027.

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Abstract Periodic generalized autoregressive conditionally heteroscedastic (PGARCH) models were introduced by Bollerslev and Ghysels [T. Bollerslev and E. Ghysels, Periodic autoregressive conditional heteroscedasticity, J. Bus. Econom. Statist. 14 1996, 2, 139–151]; these models have gained considerable interest and continued to attract the attention of researchers. This paper is devoted to extensions of the standard absolute value GARCH (AVGARCH) model to the periodically time-varying coefficients (PAVGARCH) one. In this class of models, the parameters are allowed to switch between different

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13

Cao, Shuyang. "Field mixing in a thermal medium: a quantum master equation approach." Journal of High Energy Physics 2025, no. 6 (2025). https://doi.org/10.1007/jhep06(2025)216.

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Abstract We studied the nonequilibrium dynamics of the indirect mixing of two (pseudo-)scalar fields induced by their couplings to common decay channels in a medium. The effective non-Markovian quantum master equation (QME) for the two fields’ reduced density matrix is derived to leading order in the couplings of the two fields with the medium, but to all orders of the couplings among degrees of freedom in the medium. The self-energy and noise-kernel in the QME satisfy a fluctuation-dissipation relation. The solutions show that an initial expectation value (condensate) of one field induces a c

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14

Alattar, Rand A., Shahd H. Shaar, Muftah Othman, et al. "Coronavirus disease 2019 in solid organ transplant recipients in the setting of proactive screening and contact tracing of Qatar." Qatar Medical Journal 2021, no. 2 (2021). http://dx.doi.org/10.5339/qmj.2021.23.

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Background: Clinical data on Coronavirus Disease 2019 (COVID-19) in solid organ transplant (SOT) recipients are limited. We herein report the initial clinical experience with COVID-19 in SOT recipients in Qatar. Methods: All SOT recipients with laboratory-confirmed COVID-19 up to May 23, 2020 were included. Demographic and clinical data were extracted retrospectively from the hospital’s electronic health records. Categorical data are presented as frequency and percentages, while continuous variables are summarized as medians and ranges. Results: Twenty-four SOT recipients with COVID-19 were id

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15

Dhillon, Navjot Kaur, Rajat Rana, sucheta Duhan, Sakshi Gautam, and Rajeev K. Puri. "Probing onset of nuclear vaporization in heavy ion collisions." Journal of Physics G: Nuclear and Particle Physics, March 27, 2023. http://dx.doi.org/10.1088/1361-6471/acc7bc.

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Abstract The onset of nuclear vaporization in heavy-ion collisions is examined in the present study. For this, we perform Quantum Molecular Dynamics (QMD) model calculations supplemented with clusterisation algorithm for fragment identification, namely Simulated Annealing Clusterization Algorithm (SACA) approach. Our results with much sophisticated SACA method show a nice agreement with experimental findings of vaporization (predicted by asymptotic behaviour of average fragment charge) in $^{16}$\textrm{O} $+$ $^{80}$\textrm{Br} and $^{16}$\textrm{O} $+$ $^{10&#xD;7}$\textrm{Ag} collisions

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16

Fedirko, Nicolas, Kristi Jo Wilson, Roxanne Buterakos, and Alyssa Pechta. "The Impact of Educational Handouts on the Compliance Rate for Bariatric Patient Follow-Up Appointments." Quality Management in Health Care, November 29, 2024. https://doi.org/10.1097/qmh.0000000000000494.

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Background and Objectives: Compliance rates for follow-up appointments are an issue for postoperative sleeve gastrectomy (SG) patients. Without consistent reinforcement and monitoring of patient progress, patients tend to gain the weight back, all of the medical improvements made are lost, and the ability to access patients for potential complications is denied. Patients need much reinforcement during their forever bariatric lifestyle, and the lack of consistent reminders may contribute to follow-up noncompliance and recidivism in SG patients. As time progresses, the follow-up appointment comp

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17

Sharma, Saurabh, Akhil Bhansal, Rehan Khan, et al. "The association of COVID-19 with the development of acute avascular necrosis of the head of the femur, apart from steroid usage." Qatar Medical Journal 2025, no. 2 (2025). https://doi.org/10.5339/qmj.2025.38.

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Background: The SARS-CoV-2 pandemic (COVID-19) has significantly impacted global health, with emerging evidence indicating potential long-term complications affecting various organ systems, including the musculoskeletal system, like avascular necrosis (AVN) of the femoral head. This retrospective study aims to investigate the incidence and risk factors of AVN in patients treated for COVID-19. Methods: We conducted a cross-sectional retrospective study in the department of orthopedics at a tertiary care teaching hospital in Central India from July 2022 to December 2023. Patients presenting with

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18

Iqbal, Yousaf, Majid Alabdulla, Javed Latoo, et al. "Mania and hypomania associated with COVID-19: a series of 15 cases seen by the consultation-liaison psychiatry service in Qatar." Qatar Medical Journal 2021, no. 3 (2021). http://dx.doi.org/10.5339/qmj.2021.65.

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Background: A range of neuropsychiatric diagnoses have been reported in association with coronavirus disease 2019 (COVID-19). However, only sporadic cases of mania or hypomania have been reported in patients with COVID-19. This study aimed to report clinical characteristics of 15 consecutive cases of COVID-19-associated mania or hypomania seen in three general hospitals in Qatar in the early months of the pandemic in 2020. Methods: This study is a retrospective case-note review of 15 cases of COVID-19-associated mania or hypomania (confirmed by polymerase chain reaction test), seen as inpatien

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19

Lin, Yili. "Early Detection of Basal Cell Carcinoma of Skin From Medical History." Quality Management in Health Care, December 5, 2024. https://doi.org/10.1097/qmh.0000000000000498.

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Background and Objectives: Basal cell carcinoma (BCC) is the most common form of skin cancer, originating from basal cells in the skin’s outer layer. It frequently arises from prolonged exposure to ultraviolet (UV) radiation from the sun or tanning beds. Although BCC rarely metastasizes, it can cause significant local tissue damage if left untreated. Early detection is essential to prevent extensive damage and potential disfigurement. The United States Preventive Services Task Force (USPSTF) currently remains uncertain about the benefits and potential harms of routine skin cancer screenings in

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20

Lun, Xuekun, Pinghua Zhang, Yanjun Zhang, Pan Su, and Bojun Ma. "First Report of Leaf Blight Caused by Botryosphaeria dothidea on Aucuba japonica in Zhejiang Province, China." Plant Disease, April 28, 2024. http://dx.doi.org/10.1094/pdis-11-23-2400-pdn.

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Aucuba japonica var. variegata Dombrain is a common evergreen cultivated ornamental in China (Li et al. 2016). In December 2022, severe leaf blight on A. japonica was observed next to the Meishiyuan of Zhejiang Normal University (29°8′4″N, 119°37′54″E) in Jinhua City, Zhejiang Province, China. There were seven plants in the surveyed area, and over 50% of leaves were affected. The early symptoms were small gray spot parts with brown borders on the tip of the leaves. Then the grey parts gradually expanded and became brownish black. In severe cases, the whole leaves became black and blighted. To

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21

Ali, Tamer A., Abdelwahed Samir Abougazia, Ahmed Sameer Alnuaimi, and Mona A. M. Mohammed. "Prevalence and risk factors of gallbladder polyps in primary health care centers among patients examined by abdominal ultrasonography in Qatar: a case–control study." Qatar Medical Journal 2021, no. 3 (2021). http://dx.doi.org/10.5339/qmj.2021.48.

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Background: Gallbladder (GB) polyps are raised lesions from the GB wall and projected into its lumen. The prevalence of GB polyps ranged between 4.3% and 12.3%. The clinical presentation of GB polypoid lesions vary, can be nonspecific and vague, and may be asymptomatic. Identifying malignant and premalignant polyps is important to provide treatment early and prevent cancer spread or development of malignancy. Ultrasonography (US) is the first imaging modality widely used in abdominal imaging. It is a noninvasive, rapid, painless, and safe imaging technique, with no radiation; thus, it is consi

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22

Unke, Oliver T., and Markus Meuwly. "PhysNet: A Neural Network for Predicting Energies, Forces, Dipole Moments, and Partial Charges." May 1, 2019. https://doi.org/10.5281/zenodo.3701280.

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In recent years, machine learning (ML) methods have become increasingly popular in computational chemistry. After being trained on appropriate <em>ab initio</em> reference data, these methods allow for accurately predicting the properties of chemical systems, circumventing the need for explicitly solving the electronic Schrödinger equation. Because of their computational efficiency and scalability to large data sets, deep neural networks (DNNs) are a particularly promising ML algorithm for chemical applications. This work introduces PhysNet, a DNN architecture designed for predicting ener

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23

Sneed, Penny K., Jason W. Chan, Lijun Ma, et al. "Adverse radiation effect and freedom from progression following repeat stereotactic radiosurgery for brain metastases." Journal of Neurosurgery, May 1, 2022, 1–9. http://dx.doi.org/10.3171/2022.4.jns212597.

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OBJECTIVE The authors previously evaluated risk and time course of adverse radiation effects (AREs) following stereotactic radiosurgery (SRS) for brain metastases, excluding lesions treated after prior SRS. In the present analysis they focus specifically on single-fraction salvage SRS to brain metastases previously treated with SRS or hypofractionated SRS (HFSRS), evaluating freedom from progression (FFP) and the risk and time course of AREs. METHODS Brain metastases treated from September 1998 to May 2019 with single-fraction SRS after prior SRS or HFSRS were analyzed. Serial follow-up magnet

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24

Stephane, H. Maes. "A Non-perturbative Proof of the Asymptotic Safety of 4D Einstein Gravity, With or Without Matter." May 20, 2023. https://doi.org/10.5281/zenodo.7953797.

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<em>Today, two distinct camps exist in the Physics community: those who believe in the asymptotic safe gravity program for gravity, and those who don’t. Not many physicists are undecided, even if those who claim not to care. It is a polarizing topic, and nobody seems to ever be really convinced by the arguments of the others. Add to this, the existential threat potentially posed by asymptotic safety to the physicality of supersymmetry, supergravity, superstrings, M-Theory, and many of the popular GUTs and TOEs out there, and one can understand why the question of asymptotic safety of gra

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25

Emmerson, Parker. "Vector Calculus: Infinity Logic Ray Calculus with Quasi-Quanta Algebra Limits (Rough Draft)." July 25, 2023. https://doi.org/10.5281/zenodo.8176414.

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Golden Ratio Angle in Infinity Logic Ray Calculus with Quasi-Quanta Algebra LimitsThis document explores the relationship between the golden ratio and ray tracing in the context of Infinity Logic Ray Calculus with Quasi-Quanta Algebra Limits (ILR-QAL). The paper focuses on two key aspects:<strong>Densified Sweeping Subnet:</strong> This concept involves enriching the sweeping process by incorporating an additional factor into the definition of the sweeping subnet. This results in a denser and more detailed representation of the system dynamics.<strong>Golden Ratio Angle:</strong> The analysis

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Stephane, H. Maes. "Deriving the Multi-fold Theory from General Relativity at Planck scale." February 22, 2022. https://doi.org/10.5281/zenodo.7792997.

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<em>In a multi-fold universe, gravity emerges from Entanglement through the multi-fold mechanisms. As a result, gravity-like effects appear in between entangled particles, whether they be real or virtual. Long range, massless gravity results from entanglement of massless virtual particles. Entanglement of massive virtual particles leads to massive gravity contributions at very smalls scales. Multi-folds mechanisms also result in a spacetime that is discrete, with a random walk fractal structure, and non-commutative geometry that is Lorentz invariant and where spacetime nodes and particles can

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