Hi Prof. Harrell,
Could you please elaborate on why chi-square test is more appropriate in this
case? Thank you very much!
...Tao
----- Original Message ----
> From: Frank E Harrell Jr <f.harr...@vanderbilt.edu>
> To: r-help@r-project.org
> Sent: Thu, May 13, 2010 5:35:07 AM
> Subject: Re: [R] read table for Fisher Exact
>
> 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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