01-12-2015 07:09 PM
Not sure, but you can:
1-Use the Little's MCAR Test Macro implemented in http://www.appliedmissingdata.com/macro-programs.html
2-Testing your missing data against known missing patterns as suggested in Knowledge (of your missing data) is power: handling missing values in your SAS® dataset using the %missingPattern as described in Studying missing data patterns using a SAS macro.
01-13-2015 01:25 AM
My thought is checking their frequency, and make a hypothesis test H0: mean of freq =xx .
01-15-2015 02:54 PM
Thanks to all. My sample does not meet the normality assumptions, so I used the Whitney-Mann to test between the complete and missing scores. I appreciate the replies.