I am looking for syntax to change the missing values of a variable to the average of the remaining values of the same variable   for example: for the variable duration- duration : 10 20 30 40 . . .  ( . meaning missing values ) I want to replace the three missing values with the average of 10 20 30 40. I want to repliate this over a variable having more than 1000 values.   Can anyone help me out ?   Many Thanks! ... View more