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st: RE: logistic problem with observation


From   "Steichen, Thomas J." <SteichT@RJRT.com>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: logistic problem with observation
Date   Mon, 4 May 2009 12:28:13 -0400

Tab works with character variables but logistic requires numeric variables; is this the problem here?

-----------------------------------
Thomas J. Steichen
steicht@rjrt.com
-----------------------------------

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of moleps islon
Sent: Monday, May 04, 2009 12:16 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: logistic problem with observation

Dear listers,
I encounter the following while doing a univariate logistic regression:

. logistic mors_30 sex
no observations
no observations
r(2000);

. tab sex

        sex |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,275       48.48       48.48
          2 |      1,355       51.52      100.00
------------+-----------------------------------
      Total |      2,630      100.00

. tab mors_30 sex

           |          sex
   mors_30 |         1          2 |     Total
-----------+----------------------+----------
         0 |     1,245      1,325 |     2,570
         1 |        30         30 |        60
-----------+----------------------+----------
     Total |     1,275      1,355 |     2,630


. logit mors_30 sex
no observations
r(2000);

Other variables work beautifully.


Any ideas-why?
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