fisher exact for > 2x2 table
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