Examples of zero-inflated Poisson and negative binomial regression models were used to demonstrate conditional power estimation, utilizing the method of an expanded data set derived from probability weights based on assumed regression parameter values. SAS code is provided to calculate power for models with a binary or continuous covariate associated with zero-inflation.
Doyle, Suzanne R.
"Examples of Computing Power for Zero-Inflated and Overdispersed Count Data,"
Journal of Modern Applied Statistical Methods:
2, Article 3.
Available at: http://digitalcommons.wayne.edu/jmasm/vol8/iss2/3