On testing proportional odds assumptions for proportional odds models
General Psychiatry, 2023 Proportional odds models are commonly used to model ordinal responses, but the proportional odds assumption may not hold in practice, leading to biased inference.
Xin M Tu, Hua He, Anqi Liu, Wan Tang
doaj +1 more source
Wald-Type Testing and Estimation Methods for Asymmetric Comparisons of Poisson Rates [PDF]
Statistics in Biopharmaceutical Research, 2015 This article considers the problem of asymmetric comparisons, that is, instances where one treatment serves as the compelling standard treatment for a certain disease or health condition, where the asymmetric comparisons are performed in terms of the Poisson rates.
Bright, Brianna C., Soulakova, Julia N.
openaire +1 more source
Inference in the indeterminate parameters problem
Statistica, 2013 We face an indeterminate parameters problem when there are two sets of parameters, x and g, say, such that the null hypothesis H0:x=x0 makes the likelihood independent of g. A consequence of indeterminacy is the singularity of the information matrix. For
Marco Barnabani
doaj +1 more source
Fast score test with global null estimation regardless of missing genotypes. [PDF]
PLoS ONE, 2018 In genome-wide association studies (GWASs) for binary traits (or case-control samples) in the presence of covariates to be adjusted for, researchers often use a logistic regression model to test variants for disease association.
Shuntaro Sato +2 more
doaj +1 more source
Non-Parametric Non-Inferiority Assessment in a Three-Arm Trial with Non-Ignorable Missing Data
Mathematics, 2023 A three-arm non-inferiority trial including a placebo is usually utilized to assess the non-inferiority of an experimental treatment to a reference treatment.
Wei Li, Yunqi Zhang, Niansheng Tang
doaj +1 more source
A Robust Wald-Type Test for Testing the Equality of Two Means from Log-Normal Samples [PDF]
Methodology and Computing in Applied Probability, 2018 The log-normal distribution is one of the most common distributions used for modeling skewed and positive data. It frequently arises in many disciplines of science, specially in the biological and medical sciences. The statistical analysis for comparing the means of two independent log-normal distributions is an issue of significant interest.
Ayanendranath Basu +3 more
openaire +3 more sources
Posterior-based Wald-type statistics for hypothesis testing
Journal of Econometrics, 2018 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
LI, Yong +3 more
openaire +3 more sources
The variational method, backreactions, and the absorption probability in Wald type problems
European Physical Journal C: Particles and Fields, 2021 We argue that the variational method in Wald type thought experiments, involves order of magnitude problems when one imposes the fact that $$\delta M$$ δ M is inherently a first order quantity itself.
Koray Düztaş
doaj +1 more source
Composite Likelihood Methods Based on Minimum Density Power Divergence Estimator
Entropy, 2017 In this paper, a robust version of the Wald test statistic for composite likelihood is considered by using the composite minimum density power divergence estimator instead of the composite maximum likelihood estimator.
Elena Castilla +3 more
doaj +1 more source
Homogeneity Test for Multiple Semicontinuous Data with the Density Ratio Model
Mathematics, 2023 The density ratio model has been widely used in many research fields. To test the homogeneity of the model, the empirical likelihood ratio test (ELRT) has been shown to be valid. In this paper, we conduct a parametric test procedure.
Yufan Wang, Xingzhong Xu
doaj +1 more source