Hello,
Let's say we have an ordinal variable with categories 0 to k. We take each imputed value and subtract off the minimum ordinal value (0 in this case) and divide by the ordinal range (k) and then restrict these transformations to be between 0 and 1. With these probabilities, we draw a binomial random variable for each imputed cell with k trials and probability equal to the transformed imputation from the last sentence. Lower continuous imputed values lead to lower probabilities and, thus, lower draws from this binomial. Higher imputed values lead to higher draws from this binomial.
Hope that helps!
Cheers,
matt.
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Matthew Blackwell
Assistant Professor of Political Science
University of Rochester