Evaluative

Adjective to describe activity that assesses relevance, effectiveness, and consequences.

Event rate

The proportion of patients in a group in whom an event is observed.

Experimental Evaluation

A research design in which the researcher has control over the selection of the participants in the study, and these participants ae randomly assigned to treatment or control group

US Environmental Protection Agency (2007) Program Evaluation Glossary
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Explanatory

Adjective describing something that makes observations intelligible and understandable.