survey (version 2.4)

regTermTest: 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.

See Also

anova, vcov, contrasts

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)