[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]
Re: st: Fischer Exact Test again
For purposes of calculating Fisher's exact test, that is a huge sample,
because of all the factorials that need to be computed. With moderately
sized samples in each cell, the chi-square test approaches so closely to
the exact test that there is little reason to do the exact test. David
Greenberg, Sociology Department, New York University, New York, NY
----- Original Message -----
From: "JiTian Sheu" <firstname.lastname@example.org>
Date: Monday, June 10, 2002 10:29 pm
Subject: st: Fischer Exact Test again
> Dear listers:
> I sent this subject yesterday(or the day before yesterday), and
> got the
> reply from Mr. Nick.
> I do appreciate your assistence on this subject.
> And I did try to use Auto dataset and see whether for a 2XC(C>2)
> table, I
> can obtain Fischer exact p-value or not.
> And It does work.
> However, the "auto" dataset is small, the observation is
> approximately only
> 70. Hence, STATA takes few seconds to calculate the Fischer Exact
> for this 2X5 table(foreign vs rep78).
> My problem is that my dataset is not so big(the number of
> observations for
> comparison is approximately 2000). This moring, I use -tabulate-
> to obtain
> the Fischer exact p-value. However, up to now, I still can not get the
> (This means that for a computer with 312M memory, STATA needs at
> least 10
> hours for calculating Fischer Exact p-value.)
> I am just wondering whether there is any lister having this kind of
> situation before or not, and how did you solve this situation?
> Up to the moment I send this email, I still can not get the result
> yet.Thank you very much for any of you who can respond this email.
> Thanks again.
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
* For searches and help try: