Missing value

[nohandoye]

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

[hakan_cetinkaya]

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: Advanced Calculate Question Type — KoboToolbox documentation

[nohandoye]

Thanks you very much @hakan_cetinkaya. I am trying to do that

[nohandoye]

@hakan_cetinkaya would like to use a calculate type question. How to define a modality (999) as a missing value?
For example, I have a variable Q7 AGE?
My program if(${Q7}=999,?,?)

[Kal_Lam]

@nohandoye, you could also do it as outlined in the post discussed previously:

Date control for a range with options to enter a don't know response

Hi @absiche_2692, You could do the same as outlined in the image below: In the survey tab of your xlsform: [Image 1] Data entry screen as seen in Enekto: When a wrong entry is made [Image 2] Data entry screen as seen in Enekto: When a correct entry is made [Image 3] Data entry screen as seen in Enekto: When a correct entry is made [Image 4] Reference xlsform: Constraint Test 2020 09 07.xlsx (10.1 KB) Have a great day!

[nohandoye]

Thanks you very much