Message-ID: <BANLkTimFz_A1ir+k_yQgt0_JT595s-FUbA@mail.gmail.com>
Date: 2011-04-28T20:12:21Z
From: Thomas Lumley
Subject: fisher exact for > 2x2 table
In-Reply-To: <alpine.DEB.2.00.1104281500060.9584@taxa.psych.umn.edu>
On Fri, Apr 29, 2011 at 8:01 AM, Mike Miller <mbmiller+l at gmail.com> wrote:
> On Thu, 28 Apr 2011, viostorm wrote:
>
>> I'm using fisher.exact on a 4x2 table and it seems to work.
>>
>> Does anyone know exactly what is going on? ?I thought fisher.exact is only
>> for 2x2 tables.
>
>
> You were wrong. ?I'm sure there's nothing wrong with the program. ?You will
> find that with bigger tables and larger sample sizes the computational cost
> becomes quite enormous.
In fact, with large tables, roundoff error becomes significant before
computational cost becomes prohibitive.
-thomas
--
Thomas Lumley
Professor of Biostatistics
University of Auckland