Hybrid Experimental Designs. Hybrid Designs l Variations on randomized designs l Help to address specific threats l Incorporates different design features.

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Hybrid Experimental Designs

Hybrid Designs l Variations on randomized designs l Help to address specific threats l Incorporates different design features Two will be illustrated here.

The Solomon Four-Group Design l Explicitly addresses a testing threat l Assesses the effect of taking a pretest ROXOROORXOROROXOROORXORO

Possible Outcomes Treatment Effect -- No Testing Effect

Possible Outcomes Treatment Effect and Testing Effect

Switching Replications Design l Switching: the groups switch roles over the course of the study. l Replications: the treatment is repeated or replicated. ROXOOROOXOROXOOROOXO

Possible Outcomes Short-term Persistent Treatment Effect

Possible Outcomes Long-term Continuing Treatment Effect

Switching Replications l Very strong in internal validity l Looks at short and longer term effects l Strong ethically because all participants get the treatment l Works well with some institutional structures (for example, semester system in schools)

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