Dear all,
 I run the GAMs (generalized additive models) in gam(mgcv) using the
following codes.

m.gam
<-gam(mark~s(x)+s(y)+s(lstday2004)+s(ndvi2004)+s(slope)+s(elevation)+disbinary,family=binomial(logit),data=point)

 And two repeated warnings appeared.
Warnings$B!'(B
1: In gam.fit(G, family = G$family, control = control, gamma = gamma,  ... :
  Algorithm did not converge

2: In gam.fit(G, family = G$family, control = control, gamma = gamma,  ... :
  fitted probabilities numerically 0 or 1 occurred

Q1: For warning1, could it be solved by changing the value of
mgcv.toloptions for
gam.control(mgcv.tol=1e-7)?

Q1: For warning2, is there any impact for the results if the "fitted
probabilities numerically 0 or 1 occurred" ?  How can i solve it?

 I didn't try the possible solutions for them, because it took such a longer
time to run the whole programs.
 Could anybody suggest their solutions?
 Any help or suggestions are greatly appreciated.
  Thanks.


-- 
With Kind Regards,

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Zhi Jie,Zhang ,PHD
Tel:+86-21-54237149
Dept. of Epidemiology,School of Public Health,Fudan University
Address:No. 138 Yi Xue Yuan Road,Shanghai,China
Postcode:200032
Email:epistat@gmail.com
Website: www.statABC.com
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