[R] Using termplot() with transformations of x
pdunn2 at usc.edu.au
Fri Aug 27 01:10:13 CEST 2010
I was playing with termplot(), and came across what appears to be an inconsistency.
It would appreciate if someone could enlighten me:
> # First, generate some data:
> y <- rnorm(100)
> x <- runif(length(y),1,2)
> # Now find the log of x:
> logx <- log(x)
> # Now fit two models that are exactly the same, but specified differently:
> m1 <- lm(y~log(x)) # Using log in the call
> m2 <- lm(y~logx) # Using the variable logx
> # The two termplots() are different:
I see two models that are identical, but produce different termplot()s. In both cases, the independent variable is log(x), but is just specified differently.
If this is intended, what is the logic? Or am I missing something?
R version 2.11.1 (2010-05-31)
attached base packages:
 stats graphics grDevices utils datasets methods base
Peter Dunn: Biostatistician (Room T4.12)
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