The most frequently used experimental design type for research in industrial and organizational psychology and a number of allied fields is the nonexperiment. This design type differs from that of both the randomized experiment and the quasi-experiment in several important respects. The entry on experimental designs in this volume considers basic issues associated with (a) the validity of inferences stemming from empirical research and (b) the settings in which research takes place. Thus, the same set of issues is not addressed in this entry.

Attributes of Nonexperimental Designs

Nonexperimental designs differ from both quasi-experimental designs and randomized experimental designs in several important respects. Overall, these differences lead research using nonexperimental designs to be far weaker than that using alternative designs, in terms of internal validity and ...

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