[R] confidence intervals on multiple comparisons

[Cody_Hamilton at Edwards.com]

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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             at.math.ethz.ch                                       Subject 
                                       [R] confidence intervals on         
                                       multiple comparisons                
             05/13/2007 10:51                                              
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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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