MCAR

MCAR

In statistical analysis, data that are missing completely at random (MCAR) in a data set when the event that a particular item is missing is independent of observable variables and unobservable parameters of interest.

"Missing at random" (MAR) is the alternative, suggesting that what caused the data to be missing does not depend upon the missing data itself. An example of this is accidentally omitting an answer on a questionnaire.Not missing at random (NMAR) is data that is missing for a specific reason. An example of this is if a question on a questionnaire has been skipped deliberately by the participant. This data (unlike MAR and MCAR) must be replaced or the entire case deleted before running any analyses.

References

* Weiner, I. B., Freedheim, D.K., Velicer, W. F., Schinka, J. A., & Lerner, R. M. (2003). "Handbook of Psychology". John Wiley and Sons: USA


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