On Dec 10, 2009, at 1:41 PM, Brad Fulton wrote:
Does the survey package have a function similar to prop.test() Or is
there a
way to use svyciprop() to perform a Chi-square test to see if the
difference
in proportions is significant?
That would only give you CIs around the separate proportions and you
want a CI around the difference (or odds ratio).
I'm comparing liberal congregations with conservative congregations
in their
sponsorship of HIV/AIDS programs. I want to test whether the
proportion of
liberal congregations sponsoring a program is significantly
different from
the proportion of conservative congregations sponsoring a program.
I would have thought that one of the other methods in that package
would have been chosen:
svyglm Survey-weighted generalised linear models.
svychisq Tests for two-way tables
..setting up a logistic regression model (or what should be an
comparable test with svychisq if no covariates are used) with
sponsorship as the l.h.s. outcome and liberal/conservative as a factor
on the r.h.s. of the formula.
--
David.
Thanks
Brad
Thomas Lumley wrote:
Version 3.18 of the survey package is now percolating through CRAN.
Since the last announcement on this list, in February, the main
additions
are
- svyciprop() for confidence intervals on proportions, especially in
small samples or near 0 or 1.
-thomas
Thomas Lumley Assoc. Professor, Biostatistics
tlum...@u.washington.edu University of Washington, Seattle
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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