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st: Collinearity vs. Perfect Failure / Success


From   siyama@who.int
To   statalist@hsphsun2.harvard.edu
Subject   st: Collinearity vs. Perfect Failure / Success
Date   Wed, 6 Aug 2003 16:52:53 +0200

Dear Stata-listers,

I am using a logistic model for a binary dependent variable "y" and  an
explanatory variable "waste3".  It is a comparative study of multiple sites
and hence I am producing a logit model for each site.

For a few sites I get the message 

	xi: logit   y   i.waste3
	"note: waste3 dropped due to collinearity".

For others  the message changes to

	xi: logit  y   i.waste3
	"note: waste3 != 0 predicts failure perfectly".


Will it be fair to assume that the two situations are equivalent.


Many thanks for your help in advance.


Amani

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