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What do messages about separation (complete or quasi-complete) mean, and how can I fix the problem?

April 26, 2017COMPLETE Fix mean Messages problem quasi-complete Separation

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What do messages about separation (complete or quasi-complete) mean, and how can I fix the problem?

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P. Allison, Convergence Failures in Logistic Regression, SAS Global Forum 2008 Robert E. Err, SAS Institute Inc, Performing Exact Logistic Regression with the SAS System, SUGI 25 Georg Heinze and Michael Schemper, A solution to the problem of separation in logistic regression, Statistics in Medicine, 2002, vol. 21 2409-2419.