ERIC Number: ED395963
Record Type: Non-Journal
Publication Date: 1989-Feb
Reference Count: N/A
A Note on the Covariance of the Mantel-Haenszel Log-Odds Ratio Estimator and the Sample Marginal Rates. Program Statistics Research Technical Report No. 89-85.
Holland, Paul W.
A simple technique, developed by A. Phillips (1987) is used to approximate the covariance between the Mantel-Haenszel log-odds-ratio estimator for a 2 x 2 x k table and the sample marginal proportions. These results are then applied to obtain an approximate variance estimate of an adjusted risk difference based on the Mantel-Haenszel odds-ratio estimator. The adjusted risk difference is of potential value in those applications where at least one of the sample rates is descriptive of a relevant population rate. The example applies to the use of the Mantel Haenszel estimator to study the differential difficulty of test questions across groups of examinees. (Contains 11 references.) (Author/SLD)
Publication Type: Reports - Evaluative
Education Level: N/A
Authoring Institution: Educational Testing Service, Princeton, NJ.