Quasi-Experimental DesignsLack randomization or comparison groups

• Simple time seriesO1 O 2 O 3 O 4 X O 5 O 6 O 7 O 8 Subjects serve as their own control group

• Multiple time series O1 O 2 O 3 O 4 X O 5 O 6 O 7 O 8  O1 O 2 O 3 O 4 O 5 O 6 O 7 O 8

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