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zip

Fit a zero-inflated Poisson count-response model with a logit inflation equation.

When to use

How do I model count outcomes with excess zeros and a separate zero-generation process?

Syntax

zip y x1 x2, inflate(z1 z2) [robust cluster(var) noconstant]

Examples

zip visits age income, inflate(age income)
zip claims age exposure, inflate(exposure) robust

See also