Two repeated warnings when runing gam(mgcv) to analyze my dataset?
What mgcv version are you running (and on what platform)?
n Thursday 13 December 2007 17:46, zhijie zhang wrote:
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)+disbin ary,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.
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