[R] R-squared for MARS models

Gavin Simpson gavin.simpson at ucl.ac.uk
Thu Apr 20 09:31:31 CEST 2006

On Wed, 2006-04-19 at 21:18 +0200, Marco Girardello wrote:
> Hi,
> is there an R function which can compute the R-squared
> for a mars model fitted using the mda package?
> many thanks in advance
> best regards
> Marco Girardello

Julian Faraway's "Extending the Linear Model with R" Chapman & Hall/CRC
(page 248)has a small section on MARS and compares the MARS fit with
other methods by using the MARS basis functions in a linear model to get
an R^2:

# page 248 example
a <- mars(ozone[,-1], ozone[,])
(a.summ <- summary(lm(ozone[,1] ~ a$x-1)))


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