On Sep 21, 2011, at 10:25 AM, n wrote:
Hello all,
Suppose in a logistic regression model, the binary outcome is coded as
0 or 1.
In SAS, the default probability computed is for Y = 0 (smaller of the
two values) . However, in SPSS the probability computed is for Y = 1
(greater of the two values).
Which one does R compute, the probability for the smaller or the
greater value?
I went through the documentation in a hurry but couldn't find a clue.
Thanks
Nikhil
From ?glm in the Details section:
For binomial and quasibinomial families the response can also be specified as a
factor (when the first level denotes failure and all others success) or as a
two-column matrix with the columns giving the numbers of successes and failures.
So P(Y = 1) if using 0/1.
HTH,
Marc Schwartz
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