Hello, I have created a quantitative variable “AGE” and I wish to program a modality “999” for missing value

@nohandoye , you could also do it as outlined in the post discussed previously: [image] Date control for a range with options to enter a don't know response Form Building Hi @absiche_2692 , You could do the same as outlined in the image below: In the survey tab of your xl…

Hi @nohandoye and welcome to the community! There are several ways to do that: You can add 999 as Default Response and write a hint which says something like “Please leave 999 if you don’t know the age” You can add a calculate type question and write an if-statement which you can see in here: Adv…