[R] How to compare ratio from multiple groups?

Rolf Turner rolf.turner at xtra.co.nz
Wed Jul 6 08:42:03 CEST 2011

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).


             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.

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