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Computes the derivative of the link function according to the distribution family specified in the "family" parameter.
"family"
diriv(family, muhat)
derivative of the link function for the fitted values
A description of the link function used in the model: "gaussian", "poisson", or "binomial"
"gaussian"
"poisson"
"binomial"
fitted values
Ines Ortega-Fernandez, Marta Sestelo.