「Missing data and imputation」の版間の差分
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5行目: | 5行目: | ||
|+Mechanisms (assumptions) of data missing | |+Mechanisms (assumptions) of data missing | ||
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− | !style="width:7em"| | + | !style="width:7em" rowspan="2"| |
− | !style="witdh:4em"|Abbr. | + | !style="witdh:4em" rowspan="2"|Abbr. |
− | ! | + | !colspan="2"|Does missing depend on... |
− | ![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 | + | !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)? | ||
|- | |- | ||
!Missing not at random | !Missing not at random | ||
!MNAR | !MNAR | ||
+ | |style="text-align:center"|YES | ||
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− | |||
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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 | *Some participants '''intentionally deny to report higher body weights they don't like''' and only report lower body weights they like | ||
21行目: | 24行目: | ||
!Missing at randam | !Missing at randam | ||
!MAR | !MAR | ||
− | | | + | |style="text-align:center"|NO |
− | + | |style="text-align:center"|YES | |
| | | | ||
*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: | *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: | ||
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!Missing completely at random | !Missing completely at random | ||
!MCAR | !MCAR | ||
− | | | + | |style="text-align:center"|NO |
− | + | |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 | *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 |
2023年12月10日 (日) 15:49時点における版
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Three mechanisms (assumptions) of data missing
Abbr. | Does missing depend on... | [Example] 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 value itself? | other observed variable(s)? | |||
Missing not at random | MNAR | YES |
| |
Missing at randam | MAR | NO | YES |
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Missing completely at random | MCAR | NO | NO |
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