sandwich (version 3.1-0)

estfun: Extract Empirical Estimating Functions

Description

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

Usage

estfun(x, ...)

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 \(k\)).

Arguments

x

a fitted model object.

...

arguments passed to methods.

References

Zeileis A (2006). “Object-Oriented Computation of Sandwich Estimators.” Journal of Statistical Software, 16(9), 1--16. tools:::Rd_expr_doi("10.18637/jss.v016.i09")

Zeileis A, Köll S, Graham N (2020). “Various Versatile Variances: An Object-Oriented Implementation of Clustered Covariances in R.” Journal of Statistical Software, 95(1), 1--36. tools:::Rd_expr_doi("10.18637/jss.v095.i01")

See Also

lm, glm

Examples

## linear regression
x <- 1:9
y <- sin(1:9/5)
m <- lm(y ~ x)

## estimating function: (y - x'beta) * x
estfun(m)
residuals(m) * cbind(1, x)