Significance Test for Loess vs. LM

Calculates an F test to evaluate significant differences between a LOESS model and a parametric alternative estimated with lm

testLoess(lmobj, loessobj, alpha = 0.05)

Arguments

lmobj

An object of class lm.
loessobj

An object of class loess.
alpha

Desired Type I error rate of test.

Value

Printed output describing the results of the test.

Examples


data(Prestige, package="carData")
linmod <- lm(prestige ~ income, data=Prestige)
lomod <- loess(prestige ~ income, data=Prestige)
testLoess(linmod, lomod)
#> F = 4.92
#> Pr( > F) = 0
#> LOESS preferred to alternative