PPT Slide

Campbell and Stanley Threats to Internal Validity

Evaluation of Interrupted Time Series Design

HISTORY Yes

MATURATION No

TESTING No

INSTRUMENTATION Yes

REGRESSION No

SELECTION No

MORTALITY No

SELECTION X HISTORY No

SELECTION X MATURATION No

SELECTION X INSTRUMENTATION No

CONTAMINATION No

HAWTHORNE EFFECT Yes

EXPERIMENTER EXPECTATION No

Note: “Yes” means threat is unavoidable

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