Inapplicable and missing data
I am working with an appended dataset of the 7 waves, and I noticed something weird.
Some 'basic' variables, such as sex and highest qualification (qfhigh) have too many missing values or 'not applicable'. Also, sometimes in the same pidp the variable sex in with a value in one year and missing in one other year.
Is there any procedure that should be done to report the value of these variables when missing? Why it is so?
Thanks, best, g