lincom {biostat3}

R Documentation

Linear combination of regression parameters.

Description

Using results calculated by the linearHypothesis function in the car package, calculate a linear combination of regression parameters.

Usage

lincom(model, specification, level = 0.95, eform = FALSE, ...)

Arguments

model	regression model object (as per the model argument in linearHypothesis)
specification	specification of the linear combination. This is the same as a single component of the hypothesis.matrix argument in linearHypothesis.
level	the confidence level required
eform	logical for whether to exponentiate the confidence interval (default=FALSE)
...	other arguments to the linearHypothesis function.

Details

Multiple specifications of linear combinations are called individually.

Value

A matrix with columns including the estimate, a normal-based confidence interval, test statistic and p-values.

See Also

See Also linearHypothesis.

Examples

  fit <- glm(chd ~ hieng*job + offset(log(y)), data=diet, family=poisson)
  lincom(fit, c("hienghigh+hienghigh:jobconductor",
                "hienghigh+hienghigh:jobbank"),
         eform=TRUE)

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