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title: Practical Issues
layout: remark
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# Practical Issues and Challenges #
## March 4 ##


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name: outline
## Outline

 1. Analysis-relevant practical considerations
 
 2. Discussion
 
 3. Preview of next week


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## Broken experiments

- Protocol is all about planning and anticipation

- Recall Rubin: "design trumps analysis"

- Elegance: Design so that the mean-difference is all we need

- Unfortunately, all experiments are broken experiments


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## Broken experiments

 - Attrition
 
 - N