Is there a procedure to check whether missing data are missing completely at random or missing at random?

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New Contributor
Posts: 3

Is there a procedure to check whether missing data are missing completely at random or missing at random?

I was just wondering if there was a procedure to check whether missing data are MCAR or MAR?

Super Contributor
Posts: 490

Re: Is there a procedure to check whether missing data are missing completely at random or missing at random?

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.

Grand Advisor
Posts: 9,576

Re: Is there a procedure to check whether missing data are missing completely at random or missing at random?

My thought is checking their frequency, and make a hypothesis test H0: mean of freq =xx .

New Contributor
Posts: 3

Re: Is there a procedure to check whether missing data are missing completely at random or missing at random?

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.

Super Contributor
Posts: 490

Re: Is there a procedure to check whether missing data are missing completely at random or missing at random?

then

please mark the question as answered.

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