SAS vyia for learners - unknown or nas?

[sarafrass]

Good morning,

I'm a new SAS user, I'm using SAS Vyia for learners.

I have a dataset and I found out that most of the missing values are classified as "unknown" instead of the usual "NAs". 

Should I change them with a code or does SAS recognize the fact that "unknown" is a missed value?

If I should change and replace their names in NAs, how may I do?

[Reeza · Accepted solution]

Please see your classmates question here:

https://communities.sas.com/t5/SAS-Software-for-Learning/NA-are-called-unknown-in-the-dataset/m-p/79...