Erratum to: A simple method for analyzing data from a randomized trial with a missing binary outcome
© Baker and Freedman; licensee BioMed Central Ltd. 2004
Received: 02 January 2004
Accepted: 07 January 2004
Published: 07 January 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.View ArticlePubMedPubMed CentralGoogle Scholar
- The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2288/4/1/prepub
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