R help - Jul 2011 - How to compare ratio from multiple groups?

If I have 3 groups,and for each group,I get the ratio(e.g. incidence rate).
Now I wanna compare 3 ratio pairwise,and get the corresponding p values,i.e:
group1 vs group2  ,p value=?
group1 vs group3 ,p value=?
group2 vs group3 ,p value=?

Which statistical test  should be used?

Thanks a lot for your help.

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On 06/07/11 16:26, Lao Meng wrote:
> If I have 3 groups,and for each group,I get the ratio(e.g. incidence rate).
> Now I wanna
     For crying out loud!!!  Repeat after me:  It's ***not***
``wanna'',
     it's ***want to*** .... ***want to*** .... ***want to***!!!!!!!

     The word ``wanna'' is a colloquial contraction of ``want
to''.  It
     is acceptable in *very* casual oral communication.  It is ***NEVER***
     acceptable in written communication, except in the context of
     accurately rendering (verbatim) an oral communication (or perhaps
     for the purpose of humour).

         cheers,

             Rolf Turner
> compare 3 ratio pairwise,and get the corresponding p values,i.e:
> group1 vs group2  ,p value=?
> group1 vs group3 ,p value=?
> group2 vs group3 ,p value=?
>
> Which statistical test  should be used?
>
> Thanks a lot for your help.