R: Wald test for a term in a regression model

regTermTest {survey}

R Documentation

Wald test for a term in a regression model

Description

Provides a Wald test of the hypothesis that all coefficients associated with a particular regression term are zero (or have some other specified values). Particularly useful as a substitute for anova when not fitting by maximum likelihood.

Usage

regTermTest(model, test.terms, null=NULL)

Arguments

`model`	A model object with `coef` and `vcov` methods
`test.terms`	Character string or one-sided formula giving name of term or terms to test
`null`	Null hypothesis values for parameters. Default is zeros

Value

An object of class regTermTest.

Examples

 data(esoph)
 model1 <- glm(cbind(ncases, ncontrols) ~ agegp + tobgp * 
     alcgp, data = esoph, family = binomial())
 anova(model1)

 regTermTest(model1,"tobgp")
 regTermTest(model1,"tobgp:alcgp")
 regTermTest(model1, ~alcgp+tobgp:alcgp)