SelectedWorks - Zhao (Tony) Yang, Ph.D.

Selected Works of Zhao (Tony) Yang, Ph.D.

Author

Works
About

About Zhao (Tony) Yang, Ph.D.

Applied Statistics, Biometry, Biostatistics, Categorical Data Analysis, Clinical Trials, and Statistical Methodology

Elected member, International Statistical Institute

Article

Some Remarks on Testing Overdispersion in Zero-Inflated Poisson and Binomial ...

Communications in Statistics - Theory and Methods (2010)

Zhao Yang

This note extends the score test statistics for overdispersion in Poisson and binomial regression models (Dean, 1992) to the zero-inflated ...

Link

Article

Score Tests for Zero-Inflation in Overdispersed Count Data

Communications in Statistics - Theory and Methods (2010)

Zhao Yang

The negative binomial (NB) model and the generalized Poisson (GP) model are common alternatives to Poisson models when overdispersion is ...

Link

Article

Score tests for overdispersion in zero-inflated Poisson mixed models

Computational Statistics & Data Analysis (2010)

Zhao Yang

This note is motivated by recent works of Xie et al. (2009) and Xiang et al. (2007). Herein, we simplify ...

Link

Article

A note on Dean's overdispersion test

Journal of Statistical Planning and Inference (2009)

Zhao Yang

This note discusses an extension to the score test statistics for overdispersion in Poisson and binomial regression models [Dean, C.B., ...

Link

Article

Testing overdispersion in the zero-inflated Poisson model

Journal of Statistical Planning and Inference (2009)

Zhao Yang

The zero-inflated negative binomial (ZINB) model is used to account for commonly occurring overdispersion detected in data that are initially ...

Link

Article

A score test for overdispersion in Poisson regression based on ...

Journal of Statistical Planning and Inference (2009)

Zhao Yang

Overdispersion is a common phenomenon in Poisson modeling. The generalized Poisson (GP) regression model accommodates both overdispersion and underdispersion in ...

Link

Article

Testing Approaches for Overdispersion in Poisson Regression versus the Generalized ...

Biometrical Journal (2007)

Zhao Yang

Overdispersion is a common phenomenon in Poisson modeling, and the negative binomial (NB) model is frequently used to account for ...

Link

Other

SAS Macro: Generalized McNemar's Test for Homogeneity of the ...

(2017)

Zhao Yang

This is the updated SAS macro with the improvement to address the issues of many empty cell, a real data ...

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Article

A note on generating correlated matched-pair binary data through conditional ...

Communications in Statistics - Theory and Methods (2016)

Zhao Yang

Generating correlated binary data with specified marginal probabilities and correlation structure is often needed and useful in simulation studies to ...

Link

Other

SAS Macro: Testing Marginal Homogeneity in Clustered Matched-pair Data

(2014)

Zhao Yang

The SAS Macro and simulated data example are used to demonstrate the application of tests for marginal homogeneity in clustered ...

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Article

A non-iterative implementation of Tango's score confidence interval for ...

Statistics in Medicine (2013)

Zhao Yang

For matched-pair binary data, a variety of approaches have been proposed for the construction of a confidence interval (CI) for ...

Link

Article

Confidence intervals for the difference of marginal probabilities in clustered ...

Pharmaceutical Statistics (2012)

Zhao Yang

Although there are several available test statistics to assess the difference of marginal probabilities in clustered matched-pair binary data, associated ...

Link

Article

Testing Marginal Homogeneity in Matched-Pair Polytomous Data

Therapeutic Innovation & Regulatory Science (2012)

Zhao Yang

Statistical tests for assessing marginal homogeneity of matched-pair polytomous data can be classified as a score-type test or a Wald-type ...

Link

Article

Testing ratio of marginal probabilities in clustered matched-pair binary data

Computational Statistics & Data Analysis (2012)

Zhao Yang

In diagnostic methods evaluation, analysts commonly focus on the relative size of the treatment difference (ratio of marginal probabilities) between ...

Link

Article

Testing non-inferiority for clustered matched-pair binary data in diagnostic medicine

Computational Statistics & Data Analysis (2012)

Zhao Yang

Testing non-inferiority in active-controlled clinical trials examines whether a new procedure is, to a pre-specified amount, no worse than an ...

Link

Other

R code: A non-iterative implementation of Tango's score confidence ...

(2012)

Zhao Yang

For matched-pair binary data, a variety of approaches have been proposed for the construction of a confidence interval (CI) for ...

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Article

Testing marginal homogeneity in clustered matched-pair data

Journal of Statistical Planning and Inference (2011)

Zhao Yang

For general matched-pair data with polytomous responses in biomedical research, the Stuart–Maxwell test and the Bhapkar (1966) test are commonly ...

Link

Article

A note on the tests for clustered matched-pair binary data

Biometrical Journal (2010)

Zhao Yang

McNemar's test is used to assess the difference between two different procedures (treatments) using independent matched-pair data. For matched-pair data ...

Link

Article

Comments on ‘Non-inferiority tests for clustered matched-pair data’

Statistics in Medicine (2010)

Zhao Yang

Link

Other

Generalized McNemar's Test for Homogeneity of the Marginal Distributions

(2008)

Zhao Yang

In the matched-pairs data, McNemar's test (McNemar, 1947) can be applied only to the case in which there are two ...

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Article

Kappa statistic for clustered physician-patients polytomous data

Computational Statistics & Data Analysis (2015)

Zhao Yang

The research proposes a general semi-parametric variance estimator for the Kappa statistic for the physician-patients polytomous data. Hence, the binary ...

Link

Article

Weighted kappa statistic for clustered matched-pair ordinal data

Computational Statistics & Data Analysis (2015)

Zhao Yang

This work proposes the weighted kappa statistic and its non-parametric variance estimator for clustered matched-pair ordinal data. It also establishes ...

Link

Article

A note on the kappa statistic for clustered dichotomous data

Statistics in Medicine (2014)

Zhao Yang

The kappa statistic is widely used to assess the agreement between two raters. Motivated by a simulation-based cluster bootstrap method ...

Link

Article

Kappa statistic for clustered matched-pair data

Statistics in Medicine (2014)

Zhao Yang

This paper proposes a non-parametric variance estimator for the kappa statistic under the clustered matched-pair data.

Link

Other

SAS Macro: Kappa statistic for clustered physician-patients polytomous data

(2014)

Zhao Yang

This SAS macro calculate the kappa statistic and its semi-parametric variance estimator for the clustered physician-patients polytomous data. The proposed ...

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About Zhao (Tony) Yang, Ph.D.

Disciplines

Honors and Awards

Overdispersion and zero-inflation (7)

Clustered Matched-pair Data (13)

Kappa statistic (7)