August 2009
Intermediate to advanced
648 pages
17h 35m
English
book
Categorical Data Analysis Using The SAS® System, 2nd Edition
by Maura E. Stokes, Charles S. Davis, Gary G. Koch
Content preview from Categorical Data Analysis Using The SAS® System, 2nd Edition
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5.3. Exact Tests for Association
5.3.1. General Association
In some cases, there is not sufficient sample size for the chi-square statistics discussed earlier in this chapter to be valid (several mij ≤ 5). An alternative strategy for these situations is the Fisher exact test for s × r tables. This method follows the same principles as Fisher’s exact test for the 2 × 2 table, except that the probabilities that are summed are taken from the multivariate hypergeometric distribution. Mehta and Patel (1983) describe a network algorithm for obtaining exact p-values that works much faster and more efficiently than direct enumeration; Baglivo, Olivier, and Pagano (1988), Cox and Plackett (1980), and Pagano and Halvorsen (1981) have also done work in ...
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