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Erratum to: A simple method for analyzing data from a randomized trial with a missing binary outcome
BMC Medical Research Methodology volume 4, Article number: 1 (2004)
The original article was published in BMC Medical Research Methodology 2003 3:8
In this article , equation (8) is incorrect because it omitted the covariance terms. Let h denote the number of strata, so s = 1,2,...,h. Let T denote transpose, • denote matrix product, and Diagonal Matrix [vector] denote a matrix of all 0's except for vector on the diagonal. The correct formula is
In our example, the effect of the correction was negligible; the corrected estimated standard error was the same to two significant digits as the incorrect value.
Also for clarification, we note that in the sentence after (11), it is an assumption that, within stratum s, the difference, Δ s , does not depend on the unobserved covariate x.
Baker SG, Freedman LS: A simple method for analyzing data from a randomized trial with a missing binary outcome. BMC Medical Research Methodology. 2003, 3: 8-10.1186/1471-2288-3-8.
The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2288/4/1/prepub
The online version of the original article can be found at 10.1186/1471-2288-3-8