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Score tests for zero inflation in generalized linear models
Canadian Journal of Statistics, 2000AbstractThe authors develop score tests of goodness of fit for discrete generalized linear models against zero inflation. The binomial and Poisson models are treated as examples, and in the latter case the proposed test reduces to that of Broek (1995). Some simulation results and an illustrative example are presented.
Deng, Dianliang, Paul, Sudhir R.
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Score Tests for Zero-Inflation in Overdispersed Count Data
Communications in Statistics - Theory and Methods, 2010The negative binomial (NB) model and the generalized Poisson (GP) model are common alternatives to Poisson models when overdispersion is present in the data. Having accounted for initial overdispersion, we may require further investigation as to whether there is evidence for zero-inflation in the data. Two score statistics are derived from the GP model
Zhao Yang +2 more
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Score Test for Zero Inflated Generalized Poisson Regression Model
Communications in Statistics - Theory and Methods, 2005In certain applications involving count data, it is sometimes found that zeros are observed with a frequency significantly higher (lower) than predicted by the assumed model. Examples of such applications are cited in the literature from engineering, manufacturing, economics, public health, epidemiology, psychology, sociology, political science ...
Pushpa Lata Gupta +2 more
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Two-step testing in employee selection: is score inflation a problem?
Human Resource Management International Digest, 2008Unproctored Internet testing in employee selection has become increasingly popular over the past few years. However, there is a concern that cheating during unproctored administrations may influence the test results in terms of score inflation. The current research attempts to determine the extent of cheating on an unproctored Internet test of ...
Christopher D. Nye +3 more
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Score tests for overdispersion in zero-inflated Poisson mixed models
Computational Statistics & Data Analysis, 2010zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Yang, Zhao +2 more
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A score test for zero-inflation in multilevel count data
Computational Statistics & Data Analysis, 2009zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Moghimbeigi, Abbas +3 more
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A Score Test for Zero Inflation in a Poisson Distribution
Biometrics, 1995When analyzing Poisson-count data sometimes a lot of zeros are observed. When there are too many zeros a zero-inflated Poisson distribution can be used. A score test is presented to test whether the number of zeros is too large for a Poisson distribution to fit the data well.
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Score tests for zero-inflated generalized Poisson mixed regression models
Computational Statistics & Data Analysis, 2009zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Xie, Feng-Chang +2 more
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A score test for overdispersion in zero‐inflated poisson mixed regression model
Statistics in Medicine, 2006AbstractCount data with extra zeros are common in many medical applications. The zero‐inflated Poisson (ZIP) regression model is useful to analyse such data. For hierarchical or correlated count data where the observations are either clustered or represent repeated outcomes from individual subjects, a class of ZIP mixed regression models may be ...
Xiang, L. +3 more
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Computers in Human Behavior, 2009
A natural experiment is reported in which the performance of two cohorts of undergraduate students on identical tests of cognitive achievement is compared under differing conditions of proctoring and modes of administration, total N=302. Between-subjects and within-subjects analyses reveal clear effects of test score inflation in the unproctored ...
Carstairs, Jane, Myors, Brett
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A natural experiment is reported in which the performance of two cohorts of undergraduate students on identical tests of cognitive achievement is compared under differing conditions of proctoring and modes of administration, total N=302. Between-subjects and within-subjects analyses reveal clear effects of test score inflation in the unproctored ...
Carstairs, Jane, Myors, Brett
openaire +2 more sources