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There is a command in R to derive the variance-covariance matrix of a glm (model) objects. Does any one know if there is a command which one can derive variance-covariance matrix of a Zero inflated Poisson regression model object?

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closed as off-topic by Scortchi - Reinstate Monica Oct 14 '16 at 10:26

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  • $\begingroup$ what do you mean by VC matrix of a model? please add some details $\endgroup$ – TPArrow Oct 14 '16 at 10:18
  • $\begingroup$ I mean covariance matrix of all coefficients in the model. Anyways, I got my answer, I can simply used the command "vcov". $\endgroup$ – Sedi Oct 14 '16 at 10:22
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"vcov" is the command. It gives covariance matrix of all coefficients in the model (derived from the Hessian of the optim output).

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