Generic function for extracting the empirical estimating functions of a fitted model.

estfun(x, ...)

## Arguments

x a fitted model object. arguments passed to methods.

## Value

A matrix containing the empirical estimating functions. Typically, this should be an $$n \times k$$ matrix corresponding to $$n$$ observations and $$k$$ parameters. The columns should be named as in coef or terms, respectively.

The estimating function (or score function) for a model is the derivative of the objective function with respect to the parameter vector. The empirical estimating functions is the evaluation of the estimating function at the observed data ($$n$$ observations) and the estimated parameters (of dimension $$k$$).