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-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Jitian Sheu
Sent: Wednesday, June 09, 2004 2:22 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: survey command+subpop() option
Hello, listers:
I am using -svytab- to obtain the chi-square and F-value.
The data contains
(1) an illness, denote as "cat";
(2) ethnicity (race=1, 2, and 3)
(3) for race=2, there are four gropus (denoted as "latinos") ==> Hence, the
variable(LATINOS) is not equal to missing if race==2 (Or, latinos==. if
race~=2)
The command I used is as following:
svytab cat latinos
==> Stata always return me the following message:
stratum with only one PSU detected
r(460)
I konw this is because under the subsample of race=2(latino~=missing0, some
stratum are only with one PSU
Some of my friends told me that I can solve this problem by specifying the
option, subpop(if race==2).
Since they have the similar problem when using -svymean-.
However, when I use the following command:
svytab cat latinos, subpop(if race==2)
I obtain the following message:
NOTE: subpop() subpopulation is same as full population
subpop()=1 indicates observations in subpopulation
subpop()=1 indicates observations not in subpopulation
stratum with only one PSU detected
r(460)
Does any one have any suggestions?
thanks
JT
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