[R] probability values ?

[orkun]

Hello

I try to find probability values of some predictor combinations using 
logistic reg. in response level.
Firstly I found coefficients by glm function.
Then I followed two ways to get probability values:
1- probility <- exp(X0+bX1+cX2+...)/((1+exp(X0+bX1+cX2+...))
2- probility <- predict(glm.obj,type="resp")

Should have these two given same result ?
if so, I did not have. Why ?

Does anyone have any idea ?

thanks in advance

Ahmet Temiz
TURKEY


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