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External Validity

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PPGPortal > Home > Concept Dictionary > D, E > External Validity

External Validity

The extent to which the results of a study can be generalized (applied) beyond the sample examined in a study.

(Phil Oreopoulos, Toronto PPG 1004H)


Concerns about external validity surround the question of whether it is possible to apply what is learned in a study to other people (population validity) or settings (ecological validity). For example, a study of fifth graders in a rural school that found one method of teaching spelling was superior to another may not be applicable with third graders (population) in an urban school (ecological).


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