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using GAM to assess the linearity in logistic regression

ronggui 
as agresti(2002) points out that we had better to screen the data to see if the the logit(pi) and the predictor has linear realtionship in logistic regressin.and i find some materials  in MASS and the refernce of s-plus.but it is a bit  simple and i can not exactly master the means to assess the linearity in logistic regression. so anyone suggest some materials?

i am not familiar with GAM,but i think thers maybe some materials can let me use GAM to assess the linearity in logistic regression without master GAM model. is it right?

thank you!

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ronggui using GAM to assess the linearity in logistic regression Apr 1 Wensui Liu using GAM to assess the linearity in logistic regression Apr 1 ronggui using GAM to assess the linearity in logistic regression Apr 1 John Fox using GAM to assess the linearity in logistic regression Apr 2