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Mathematics, 2023 This study is intended as a note and provides an extension to a much-used and established test for portfolio efficiency, the Gibbons, Ross, and Shanken GRS-Wald test.
Pankaj Agrrawal
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A Note on the Wald, Lagrangian Multiplier and Likelihood Ratio Tests when the Information Matrix is Singular [PDF]
The Egyptian Statistical Journal, 1988 Modified formulas for the Wald and Lagrangian multiplier statistics are introduced and considered together with the likelihood ratio statistic for testing a typical null hypothesis Ho stated in terms of equality constraints.
Abdalla El-Helbawy, Tawfik Hassan
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Latent-variable Approaches Utilizing Both Item Scores and Response Times To Detect Test Fraud
Open Education Studies, 2021 There is a growing interest in approaches based on latent-variable models for detecting fraudulent behavior on educational tests. Wollack and Schoenig (2018) noted the presence of five types of statistical/psychometric approaches to detect the three ...
Sinharay Sandip
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A power approximation for the Kenward and Roger Wald test in the linear mixed model.
PLoS ONE, 2021 We derive a noncentral [Formula: see text] power approximation for the Kenward and Roger test. We use a method of moments approach to form an approximate distribution for the Kenward and Roger scaled Wald statistic, under the alternative.
Sarah M Kreidler +3 more
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A New Matrix Statistic for the Hausman Endogeneity Test under Heteroskedasticity
Econometrics, 2023 We derive a new matrix statistic for the Hausman test for endogeneity in cross-sectional Instrumental Variables estimation, that incorporates heteroskedasticity in a natural way and does not use a generalized inverse.
Alecos Papadopoulos
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Orthopaedic Journal of Sports Medicine, 2020 Background: Arthroscopic rotator cuff repair can be quite complex and time consuming, particularly early in the surgeon’s learning curve. Hypothesis: Patients who have undergone rotator cuff repair with shorter operative times will be less likely to have
Ashleigh R. Elkins MD +2 more
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Frontiers in Psychology, 2022 Within the framework of constrained statistical inference, we can test informative hypotheses, in which, for example, regression coefficients are constrained to have a certain direction or be in a specific order. A large amount of frequentist informative
Caroline Keck, Axel Mayer, Yves Rosseel
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Location-adjusted Wald statistics for scalar parameters [PDF]
Computational Statistics & Data Analysis, 2019 Inference about a scalar parameter of interest is a core statistical task that has attracted immense research in statistics. The Wald statistic is a prime candidate for the task, on the grounds of the asymptotic validity of the standard normal approximation to its finite-sample distribution, simplicity and low computational cost.
Claudia Di Caterina, Ioannis Kosmidis
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On a Constrained Testing Hypotheses Problem. [PDF]
The Egyptian Statistical Journal, 1997 This paper gives a proof that the likelihood ratio statistic, based on a sample x= (x1,…,xn) on a p-dimensional random variable X, converges in distribution to a noncentral chi-square distribution under a class of local alternatives, for a multi ...
Naeem Soliman
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BMJ Open, 2021 Objectives To investigate the bacterial aetiologies and associated risk factors of gastroenteritis among typhoid suspected cases.Design Cross-sectional study.Setting This study was conducted at Dschang District Hospital of the Menoua Division, West ...
Christopher Tume +6 more
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