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These dummy variables indicate whether or not the data in the predictors is missing (Cohen and Cohen, 1985). Single imputation refers to fill in one value for each missing value in a variable (Haukoos and Newgaurd, 2007).
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.