DAMisc (version 1.3)

crSpanTest: Test of Span Parameter in linearity for Component + Residual Plots

Description

This function performs crTest for a user-defined range of span parameters, optionally allowing for multiple testing corrections in the p-values.

Usage

crSpanTest(model, spfromto, n=10, adjust.method="none", 
    adjust.type=c("none", "across", "within", "both"))

Arguments

model

A model object of class lm

spfromto

A vector of two values across which a range of n span values will be generated and tested.

n

Number of span parameters to test.

adjust.method

Adjustment method for multiple-testing procedure, using p.adjust from stats.

adjust.type

String giving the values over which the multiple testing correction will be performed. Here, both refers to a multiple testing correction done over all span parameters and all variables in the model. within means the m

...

Other arguments to be passed down to the call to loess.

Value

• A list with two elements:
• x
  Sequence of span values used in testing
• y
  p-values for each variable for each span parameter

Examples

library(car)
mod <- lm(prestige ~ income + education + women, data=Prestige)
tmp <- crSpanTest(mod, c(.1, .9), adjust.method="holm", 
	adjust.type="both")
matplot(tmp$x, tmp$y, type="l")