Cochran s statistic

A similar test statistic, Cochran s statistic, originally attributed to Cochran (1954), is described by Fleiss et al. (2003) ... 

Note that Cochran s statistic does not use a correction factor and the denominator of the stratum weights is instead of (k - 1). We mention Cochran s statistic because it is used by some statistical software packages instead of the Mantel-Haenszel statistic. Fleiss points out that the difference between the Mantel-Haenszel statistic and Cochran s statistic is small when the sample sizes are large, but considerable when the sample sizes within each of the strata are small. 

Although the calculation details are not shown here, the value of Cochran s statistic for this example is 28.47, which is consistent with the result obtained for the Mantel-Haenszel statistic. 

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See also in sourсe #XX -- [ ]

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