 impute missing data?

What can we do practically to prevent or respond to attrition?
 
 - Adaptive design: anticipate spending more resources on those likely to attrit
 - Pretesting: try to assess who is likely to attrit in a pilot study so you can identify where to expend resources

 - Treatment attrition versus measurement attrition
  - Measurement attrition is a missing data problem
  - Treatment attrition means we don't even know if the unit would have taken their assigned treatment


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## Noncomplia