Resumo

PEREZ, Luis Manuel; SANCHEZ, Lourdes; MARTINEZ DE CORDERO, Harú  e  QUINTANA, William. Comparison between permutation and asintotics tests applied to unordered rxc dimension contingency tables used in biomedical surveys. Salus [online]. 2013, vol.17, n.1, pp.40-46. ISSN 1316-7138.

A comparative study between permutation and asymptotic tests applied to unordered R×C dimension contingency tables was carried out, using the difference between the exact p-value and the asymptotic one as comparison measurement. Five (05) biomedical research-paper results based on unordered contingency tables were examined from international scientific literature, analyzing how different or equivalent they appear using Pearson, Likelihood ratio and Freeman-Halton independency tests. Results revealed that both methodologies, exact and asymptotic, behave depending on sample size, dimensions, balance and dispersion of the contingency table, as well as on the test applied. The exact and asymptotic p-values showed striking differences for small sample sizes mainly in unbalanced and sparse contingency tables, but they converged as the sample size and table dimensions increased.

Palavras-chave : Permutation tests; asymptotic tests; unordered contingency tables; p-value.

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