[R] clogit question

Dan Chan dchan at GFC.STATE.GA.US
Thu Mar 23 15:32:55 CET 2006


I am playing with 
from clogit help file.

This line works. 

1. But, why strata(stratum) doesn't have a coefficient like spontaneous
and induced?
2. When I remove strata(stratum) from the command, this function seems
to keep running forever.  Why?  
3. I think the equation for clogit looks like
P=1/(1+ exp(-1*(a+bx+cy+.....))
In this example, I think the spontaneous is x, induced is y.  So, b is
the coefficient for spontaneous and c is coefficient for induced.  Where
can I find a?  

Thank you. 

Daniel Chan
Georgia Forestry Commission
P O Box 819
Macon, GA 
Tel: 478-751-3508
Fax: 478-751-3465

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