DAVID W. FRASER, M.D.
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To the editor: I wish to point out the statistical errors in the paper by Drs. Comty, Cohen, and Shapiro on uremic pericarditis in the August issue (Ann Intern Med 75:173-183, 1971).
The authors point out that their chi-square manipulations "cannot be taken at face value." In fact, the chi-square test is inappropriate for data with such small observed and expected values; the Fisher's exact test is suitable.
None of the individual entries nor subtotals recorded in their Table 8 as "expected" is correct. In addition, the subtotals of "expected" add up to 22, not 25.
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FRASER DW. Statistics on Uremic Pericarditis. Ann Intern Med. 1971;75:976. doi: 10.7326/0003-4819-75-6-976_1
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Published: Ann Intern Med. 1971;75(6):976.
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Print ISSN: 0003-4819 | Online ISSN: 1539-3704
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