On Fri, May 30, 2008 at 4:42 PM, Michael McCulloch <[email protected]> wrote:
Hello,
I'm creating survival data, and puzzled by two observations here, which
probably reflect my elementary knowledge of the subject. Perhaps someone can
offer some helpful advice.
2. Why the confounder variable "w" is dropped due to collinearity?
Because w only takes two values depending on the value of "a"
. disp (1/(1+exp(-(-1.74))))
.14931293
. disp (1/(1+exp(-(-1.74+1))))
.32300414
Scott
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