Score tests for zero inflation in generalized linear models

By D. Deng, S. Paul. 2000

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Pearson's goodness of fit statistic as a score test statistic (2003, background): “For this reason score tests have been proposed frequently in generalized linear model contexts to test for various sorts of model complications such as overdispersion [3, 5, 7, 13, 19, 24], zero inflation [8], adequacy of the link function [9, 20], or extra terms in the fitted model [1, 2,4, 19, 21,”
Multilevel zero-inflated negative binomial regression modeling for over-dispersed count data with extra zeros (2008, background): “In the literature, some tests for testing ZIP in independent 4 8 19 and correlated data 23 have been developed.”
SCORE TESTS FOR ZERO-INFLATION AND OVER-DISPERSION IN GENERALIZED LINEAR MODELS (2005, background): “Deng and Paul (2000) develop score tests to detect zero-inflation in a generalized linear model and obtain Broek’s results as special cases.”