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