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  1. R

    Confounder confounds at only one level of polytomous variable

    Hello! I have looked for a post on this but have been unsuccessful. It would be great if you could help. I am using logistic regression in SAS. I have a polytomous variable, race, with 5 levels. When I add covariate A, the coefficient of only 1 level of race changes significantly (by 44%)...