Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

A form of research where the investigator has no control over the independent variable, but has power over how the dependent variable is measured. For instance, in cases of large groups responding to disasters. Also refereed to as non-experimental research.

QUASI-EXPERIMENTAL RESEARCH: "The speed at which neighborhoods recovered from the flood is an example of quasi-experimental research."

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