[R] [R-pkgs] survey package (3.18)

[David Winsemius]

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
>> tlumley at u.washington.edu	University of Washington, Seattle
>>
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>
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT