I have a dataset with only categorical variables. Some of the variables have missing values but I only want to impute missing values for one variable and to leave the others alone. Is it acceptable to fill them in with temporary flags for missing values so that the function doesn't impute them? Like this. Let's say I don't want to impute the missing values for Var1. Var1 -> Var1 'Cat' -> 'Cat' 'Dog' -> 'Dog' ' ' -> 'ZZZ'
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