# [R] Two repeated warnings when runing gam(mgcv) to analyze my dataset?

From: zhijie zhang <epistat_at_gmail.com>
Date: Fri, 14 Dec 2007 01:46:03 +0800

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：
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
Postcode:200032
Email:epistat_at_gmail.com
Website: www.statABC.com
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