Documents/TM4RG/2: METRICS & METHODS/II.C.i: Experimental Design

II.C.i: Experimental Design

Use random assignment to compare results between the two groups to establish the effect of the program.

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Experimental designs use random assignment; researchers randomly assign one group of people to be program participants and another group to be non-participants, and compare results between the two groups to establish the effect of the program. Experimental designs are often commonly referred to as randomized controlled trials, or RCTs, and when done correctly are often thought of as the most rigorous research design. For example, researchers may be interested in finding out whether participating in a microfinance program leads to higher savings on average. After obtaining a list of people who wish to participate in the program, they would randomly assign half of the people to the program group and the other half to the control group, who would not receive the program. The only difference between the control group and program group is access to the program.  This means that researchers would be able to confidently conclude that it is the program which causes higher savings for the program group rather than some other characteristic or phenomenon.

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