CODEWITHSUNDEEP
rplotsyntaxpackagegam
brienna
brienna

Reputation: 1604

Could not find function plot.gam

I'm going through the "Introduction to Statistical Learning with Applications in R" (ISLR), and I'm stuck on a part on page 295, the lab on Generalized Additive Models. When I run the following code I get an error Error in plot.gam(gam1, se = TRUE, col = "red") : could not find function "plot.gam".

library(ISLR)
gam1 = lm(wage ~ ns(year, 4) + ns(age, 5) + education, data=Wage)
par(mfrow=c(1,3))
plot.gam(gam1, se=TRUE, col="red")

The book says that plot.gam should be part of the general plot function, so why can't R find it? Am I supposed to be doing something differently? I tried unsuccessfully to re-download the plot library with install.packages('plot', repos='http://cran.us.r-project.org').

This confuses me because the book says this:

The generic plot() function recognizes that gam2 is an object of class gam, andinvokestheappropriateplot.gam()method.Conveniently,eventhough plot.gam() gam1 is not of class gam but rather of class lm, we can still use plot.gam() on it. Figure 7.11 was produced using the following expression:

plot.gam(gam1, se=TRUE, col="red")

Upvotes: 3

Views: 3641

Answers (1)

Gregor Thomas
Gregor Thomas

Reputation: 145765

Use plot.Gam not plot.gam.

Software updates, but the book has not kept up. Checking the change log for the gam package, we can see that the case was changed in early 2018:

2018-02-06 Trevor Hastie version 1.15 * major change class "gam" to "Gam" to avoid conflict with mgcv (grr!)

Upvotes: 9

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