Your degrees of freedom are 16??
What is your sample size?
-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Jennifer
Schmitt
Sent: September 3, 2009 11:26 AM
To: statalist@hsphsun2.harvard.edu
Subject: st: Survey design degrees of freedom help
Hello everyone,
I need some important clarification about the design degrees of freedom
for stratified clustered survey analysis. I have data that was
stratified by three areas (NW, SW, and E). We randomly chose villages
from these three areas, then chose 5 subvillages within the village and
within the subvillage we chose households (the unit of interest for my
analysis). I am running logistic regressions with PSU = village, strata
= area and probability weights. My design degrees of freedom are 16
(PSU-strata-one for the constant term). I get that. What I do not
understand is WHY and how to explain to others unfamiliar with STATA
that it is correct, any answers to this would be greatly appreciated.
The reason this is an issue is that I want to test more than 16
variables at once and obviously I can't with only 16 df. Thank you.
Jennifer
--
Jennifer Schmitt
PhD Candidate - Conservation Biology Program
University of Minnesota
jorg0206@umn.edu
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