Hi I need to impute data with two types of missing. Some are real missing that I want to impute (participants should have answered the questions, but they skipped it or they were not exposed to it (planned missingness)). Others are "not applicable" items, so I do not want to impute them... The two types have different codes in the database (888 for N/A and 999 for missing). The problem is that I don't know how to prevent the 888s to be taken as valid value in the imputation model... I want the items to be taken into account in the imputation model when they have a valid value (that is not 888) and to be imputed when their value is 999. How can I avoid the "not applicable" code 888 being taken as a valid value? Is there an easy way to implement this in AmeliaView? (I do not use R.) Hope I am clear enough... I could not find any information about this issue (although it must be very common), but I might not have the right keywords. Very many thanks, Martin