[R] Predicted values from a logistic model

MANASI VYDYANATH manasi.vydyanath at gmail.com
Mon May 14 03:49:44 CEST 2007

Hello -

I apologize if this question is simple/obvious, but I couldn't find a  
satisfactory answer online, and I am not very accustomed to working  
with R (Matlab is my poison. :-)). Any help would be greatly  

I have a model with a three-level factor and a continuous covariate.  
The call I use is:

mymodel <- glm(Response ~ Factor_covariate + continuous_covariate -  
1, family = binomial(link = "logit"))

I would like to generate predicted values for a given level of the  
covariate, and a given level of the factor. For instance, I want it  
to give me a fitted value for the response at factor level 1 and  
continuous covariate value 10. How would I go about expressing this?  
I tried to look at the package Design, and specifically, at the  
command "predict.lrt". But I was unable to quite understand how I  
ought to enter my x-values.  Again, any help would be much appreciated.

Thank you for taking the time to read this!



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