Estimates Cut-point Parameters for Fitted repolr Model

Description

After fitting a model using repolr, function polycuts gives estimates and standard errors for the K-1 cut-point parameters, based on the polynomial model from the fit of repolr. Polynomial cut-point parameter estimates from the orginal model are also shown.

Usage

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polycuts(object, digits = 3, robust.var = TRUE)

Arguments

object

is a model fitted using repolr.

digits

the number of decimal places to display in reported summaries.

robust.var

a logical variable: if TRUE standard errors are based on robust variance estimates, otherwise naive estimates are used.

Value

coef

polynomial parameter estimates from repolr.

poly

a vector of K-1 cut-point parameters.

order

the order of the polynomial.

Examples

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data(HHSpain)
mod.0 <- repolr(HHSpain~Sex*Time, data=HHSpain, categories=4, subjects="Patient",
            times=c(1,2,5), corr.mod="uniform", alpha=0.5)
summary(mod.0)
mod.1 <- update(mod.0, poly=1)
summary(mod.1)
polycuts(mod.1)
mod.2 <- update(mod.0, poly=2)
summary(mod.2)
polycuts(mod.2)