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st: RE: STATA and NHIS data - Elementary Question

From   "Alexander Tsai" <>
To   <>
Subject   st: RE: STATA and NHIS data - Elementary Question
Date   Mon, 23 Aug 2004 17:41:22 -0400

Hi Marisa,

An explanation of this problem is on the Stata Web site:

You might try collapsing PSUs and strata so every stratum has at least two
PSUs, i.e., use -svydes- to identify the problematic PSUs/strata, then
manually create new PSU/strata variables.

Alternatively, you might try -idonepsu-. (To find it in net-aware Stata,
type -webseek idonepsu-.)


-----Original Message-----
[] On Behalf Of Marisa Wilson
Sent: Monday, August 23, 2004 3:34 PM
Subject: st: STATA and NHIS data - Elementary Question

I am relatively new STATA user so forgive the naivete of my question to the
August users group.

I using the 2002 NHIS data and STATA 7 to do logistic regression modeling
for my dissertation analysis.  I need to use svylogit and svyset for the
weight, strata and psu variables.  However, I get a
r(460) error due to stratum with only one PSU encountered.  In svydes, I do
have several psus with entires of 1.

Is there any way around this?

Marisa L. Wilson  DNSc(c), MHSc, RN
Clinical Systems Project Leader
office 410-614-1151
pager 410-283-2605
cell     443-540-6947
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