How much would that differ? And how should I build my table if I want to do a
Pearson Chi Sqaure?
----- Original Message -----
From: "Frank E Harrell Jr [via R]"
<ml-node+2197479-2091597772-257...@n4.nabble.com>
Date: Thursday, May 13, 2010 2:36 pm
Subject: Re: read table for Fisher Exact
To: visser <s.m....@amc.uva.nl>
> On 05/12/2010 03:31 PM, visser wrote:
> >
> > i have 2 groups i want to compare: group A and group B
> > each group contains let's say 20 patients
> > i want to perform a Fisher Exact test on genotype distribution
> > so, see if there is a sign diff in genotpe frequency/distribution
> (#AA, #AB,
> > #BB) between group A and B
> > not for 1, but for 1000 different genes
> >
> > my question: how should i build my table so i can do:
> >
> > test<- read.table("table1.txt")
> > fisher.test(test)
> >
> > i know a lot is still missing in the syntax, but i do not know what.
> any
> > help would be soo much appreciated!!
>
> Note that in this case, Fisher's exact test has a good chance of being
>
> less accurate than an approximate Pearson chi-square test.
>
> --
> Frank E Harrell Jr Professor and Chairman School of Medicine
> Department of Biostatistics Vanderbilt University
>
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