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marktest
2008 Jun 12
1
Problems with mars in R in the case of nonlinear functions
...lues,nrow=nrow(x),byrow=F),ticktype='detailed',
col='lightblue',
xlab='x',ylab='y',zlab='z',shade=.75,ltheta=50,main='MARS',
phi=25,theta=55,zlim=lims)
(the code is also here if someone wants to try it:
http://venda.uku.fi/~jmhuttun/R/marstest.R)
The results are here: http://venda.uku.fi/~jmhuttun/R/R-10.pdf . The
fitted model contains only
5 terms which is not enough in this case. Adjusting parameters like nk,
thresh, penalty and degree
seems only have minor effect or no effect at all. It's also strange that
when I increase
the...