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→Three mechanisms (assumptions) of data missing
*'''15% of female participants denied to report''' their body weights after participation '''regardless of measured body weights''', but only 1% of male denied to report
*Researchers can identify that female participants more likely denied to report body weights than male
**Missing occurred not NOT because of body weights themselves but '''because of another variable ''sex'''''
**Missing mechanism is at random, i.e., free from missing values only inside each participant but NOT at random, i.e., NOT free from variable ''sex''
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*A participant '''moved to outside cohort area''' because of family affair and was lost to follow up
*A participant '''failed to report body weights because of malfunction of the app'''
**Missing occurred not NOT because of body weights themselves nor NOR other variables
**Missing mechanism is completely at random, i.e., completely free from both of missing (unobserved) values and observed values in body weight or in other variables
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