Dear Fabricio,
The answer depends on the original survey design. If the sample was
stratified by each of the religious groups, then you can subset to the
group or groups of interest, and analyze data from just those groups
using logit.survey. If the sample was stratified using other
background characteristics, then subsetting to the religious groups
*and* employing survey weights will not create a representative
sample. In this case, you have to refer to the survey design (which
should be in the documentation of the particular survey) for guidance.
If you know something about the alternative target populations (e.g.,
protestant, catholic, etc), then you could possibly reweight the data
after subsetting.
Yours,
Olivia
2009/10/7 Fabrício Mendes Fialho <fabriciofialho(a)gmail.com>om>:
Hi there,
I would like to know how may I obtain analysis for subgroups/subpopulations
using Zelig. For instance, let suppose I am analyzing data on political
participation and religion, and I would like to estimate the effects of
political sofistication on electoral outcome. My data is from a complex
sample survey. Let also suppose respondents were classified in "protestant",
"catholic", and "others". Considering theoretical issues, it would
be
interesting to estimate the effect of political sofistication and electoral
outcome just for the "protestant" group.
How should I proceed to obtain this coefficient only for a subgroup (for
instance, "protestants")? How can I select this subgroup in my sample when I
am running my analysis? For instance, I would like to run a "logit.survey"
model, and I intend to include survey design information (PSU and weights)
in my model. I would like to know how can I run analysis for this subgroup
without just delete the other cases from my dataset since this procedure
would distort the original sample design. Should I just set the weight to
zero for observations outside the subset of interest? Or is there other way
to proceed? And if I intend to run a "logit" model (not a
"logit.survey"),
what should I do?
I looked for directions about this in Zelig manual, but I did not find
instructions for this kind of analyses.
Best regards,
Fabricio
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