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st: Fisher's exact test in r x c contingency tables
in my understanding Fisher's exact test (FET) is applicable in
2x2 contingency tables only. However, Stata help contends
that "... Fisher's exact test ... may be applied to r x c tables
as well as to 2x2 tables".
I have heard of some algorithm in SAS that seems to apply FET
to r x c tables, but I still wonder whether this is appropriate. Is Stata
maybe computing something similar? The only difference in output
is that in 2x2 tables, 1- and 2-sided p values are computed, whereas
in r x c tables one (apparently one-sided) p value only is shown.
What is your opinion? At the moment I rather think about applying
tests that were designed for ordinal / ordinal relationships in r x c
contingency tables (say, Goodman and Kruskal's gamma) than
embarking on a potentially hazardous procedure.
Marcus Matthias Keupp, Dipl.-Kfm.
University of St. Gallen
Institute of Technology Management
CH-9000 St. Gallen / Switzerland
Tel. +41 (0)71 224 7236
Fax +41 (0)71 224 7301
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