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st: -logit- interpretation question


From   Michael Crain <michaelcrain@hotmail.com>
To   Statalist <statalist@hsphsun2.harvard.edu>
Subject   st: -logit- interpretation question
Date   Fri, 27 Nov 2009 13:58:39 -0500

I have a data set of 35 observations with the predictor variable (x1) using the Likert scale and y = 0 or 1. 
I run -logit- and -logistic- (Stata v 10) and get a result that says:
 
note: outcome = x1> 3 predicts data perfectly except for
      x1 == 3 subsample:
      x1 dropped and 28 obs not used
 
-logit- is dropping 28 of the 35 observations and is using only 7 observations 
for the logit model but I don't understand the theoretical reason for doing so. 
 
 
clear
input y x1
1 4
1 4
1 3
1 4
1 4
1 4
1 4
1 3
1 3
1 3
1 3
0 3
0 1
0 2
0 2
0 2
0 2
0 2
0 2
0 2
0 2
0 2
0 2
0 3
0 2
0 1
0 1
0 2
0 1
0 2
0 1
0 2
0 1
0 1
0 1
end
scatter  y x1, jitter(5)
tab y x1
logit y x1
logistic y x1

 		 	   		  
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