Abstract:For the analysis of count data from comparative clinical study with patient screening which refers to the baseline observation, Cook and Wei (2003) proposed a conditional Gamma-Poisson model as a natural extension of ANCOVA. However, in some cases this model suffers from its insufficient capacity in expressing the inter-patient heterogeneity. As alternative we propose extended models that include an additional random effect into the conventional Poisson mixture, which can be estimated through conditioning by t… Show more
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