4.1.1 Impact Evaluation: Combination of Designs and/or Analyses

It may be helpful to utilize a combination of study designs to capture evidence of program effectiveness. This SEP excerpt combines two designs:

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Procedures to conduct the random assignment, including who implemented the random assignments, how the procedures were implemented, and procedures used to verify that probability of assignment groups, are described and generated by random numbers.

Blocking, stratification, or matching procedures used—to improve precision in the estimate of the program effect or to balance groups on measured characteristic(s)—are described.

Any concerns that proposed strategies or approaches will lead to nonequivalent groups are discussed.

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