[R] logistic regression by group?
noah at smartmediacorp.com
Thu Mar 4 06:56:13 CET 2010
Looking for a function in R that can help me calculate a parameter that
maximizes the likelihood over groups of observations.
The general formula is:
p = exp(xb) / sum(exp(xb))
So, according to the formulas I've seen published, to do this "by group" is
product(p = exp(x_i * b_i) / sum(exp(x_i b_i)))
Where i represents a "group" and we iterate through each group.
Does anybody have any suggestions?
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