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*Missing depends on observed data
→Three mechanisms (assumptions) of data missing
|+Mechanisms (assumptions) of data missing
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!style="width:7em" rowspan="2"|!style="witdh:4em" rowspan="2"|Abbr.!stylecolspan="width:15em2"|DescriptionDoes missing depend on...!rowspan="2"|[Example]<br>A cohort study in which participants self report their body weight every week via special app installed on their smartphones for 52 weeks in total|-!style="width:5em"|missing value itself?!style="width:5em"|other observed variable(s)?
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!Missing not at random
!MNAR
|style="text-align:center"|YES
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*Some participants '''intentionally deny to report higher body weights they don't like''' and only report lower body weights they like
!Missing at randam
!MAR
|style="text-align:center"|NO*Missing does not depend on '''unobserved (missing) values''' themselves, but may depend on '''(other) observed values'''|style="text-align:center"|YES
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*15% of female participants denied to report their body weights after the agreement regardless of measured body weights, but only 1% of male denied to report:
!Missing completely at random
!MCAR
|style="text-align:center"|NO*Missing does NOT depend on '''(other) observed values''' NOR on '''unobserved (missing) values''' themselves|style="text-align:center"|NO
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*A participant moved to outside cohort area because of family affair which has nothing to do with the study and is lost to follow up after the 10th week
