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→Three mechanisms (assumptions) of data missing
|+Mechanisms (assumptions) of data missing
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!style="width:8em"|!style="witdh:4em"|Abbr.!style="width:15em"|Description
![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
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!Missing not at random<br>!MNAR
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*Missing depends on observed data
**Researchers cannot explain/predict the missing mechanism by
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!Missing at randam<br>!MAR
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*Missing does not depend on '''unobserved (missing) values''' themselves, but may depend on '''(other) observed values'''
**Missing mechanism is NOT at random, i.e., NOT free from another variable ''sex''; missing occurred depending on the values in the variable ''sex''
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!Missing completely at random<br>!MCAR
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*Missing does NOT depend on '''(other) observed values''' NOR on '''unobserved (missing) values''' themselves
