Score tests for zero-inflated Poisson models

By N. Jansakul, John P. Hinde. 2002

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Random effect models for repeated measures of zero-inflated count data (2005, methodology): “However, when we used both van den Broek (1995) and Jansakul and Hinde (2002) score tests on our 1000 simulated data sets, all of them revealed evidence of zero inflation (P-value < 0:05 in each case). This simulation study tells us that even when a test shows significant evidence of zero inflation,”
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.”