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Re: st: Re: Fischer's exact when the expected counts are known


From   Steven Samuels <sjhsamuels@earthlink.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Re: Fischer's exact when the expected counts are known
Date   Mon, 9 Feb 2009 14:55:21 -0500


Richard has multinomial data: four categories with expected counts. There is no such thing as a Fisher Exact Test for multinomial data; Fisher's test is for two-way tables, and tests the hypothesis of independence. Richard wants to test the fit of the observed data to the expected. He needs Ben Jann's -mgof- (from SSC) or the packages listed at the bottom of its help page. -mgof- uses simulation to approximate the exact distributions of the Pearson Chi Square and likelihood-ratio goodness-of-fit tests.

-Steve
On Feb 9, 2009, at 2:06 PM, Martin Weiss wrote:

<>

-h tabi-

HTH
Martin
_______________________
----- Original Message ----- From: "Ricardo Ovaldia" <ovaldia@yahoo.com>
To: <statalist@hsphsun2.harvard.edu>
Sent: Monday, February 09, 2009 8:00 PM
Subject: st: Fischer's exact when the expected counts are known


Dear all,

Is there a command or a way to trick -tabulate- to perform a Fisher's exact test when the expected counts are known.

For example the observe counts are:
30 20 15 35

Under the null the expected counts are
20 30 30 20

I want to test this using a fisher exact test.

Thank you,
Ricardo


Ricardo Ovaldia, MS
Statistician
Oklahoma City, OK





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