[R] More questions about gam and plot

Tor A Strand Tor.Strand at cih.uib.no
Tue Jul 15 09:08:56 CEST 2003

When I use a "gam" command
c <- gam(depvar~var1+var2+s(var3)+s(var4)........)

Followed by a plot command

The standard errors cross in the middle of the graph, (This variable is
almost linearly related with the outcome variable) why?

When I use the "persp" command after the gam fit, it does not graph the
smooth terms but usually two of the other terms in the model, why?

Dr. Tor A Strand   
Centre for International Health
Haukeland Hospital
University of Bergen
5021 Bergen    
Phone: (country prefix 47)
Residence:56 51 10 88, office: 55 97 49 80,
fax: 55 97 49 79, cellular:  90 97 10 86

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