Re: [R] confidence intervals on multiple comparisons

From: <Cody_Hamilton_at_edwards.com>
Date: Tue, 15 May 2007 12:51:53 -0700

Enrico,

prop.test is for testing proportions two at a time. If you want to test for differences between 4 proportions simultaneously (rather than two at a time), try a logistic regression model (from which you can get confidence intervals for each of your groups).

Cody Hamilton, PhD
Staff Biostatistician
Edwards Lifesciences

                                                                           
             "Salvatore Enrico                                             
             Indiogine"                                                    
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                                       [R] confidence intervals on         
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Greetings!

I am using prop.test to compare 4 proportions to find out whether they are equal. According to the help function you can not have confidence intervals if you compare more than 2 proportions.

I need to find an effect size or confidence interval for these proportions.

Any suggestions?

Enrico

--
Enrico Indiogine

Mathematics Education
Texas A&M University
hindiogine_at_gmail.com


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Received on Tue 15 May 2007 - 20:08:23 GMT

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