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Peer reviewedWillemain, Thomas R.; Hartunian, Nelson S. – Evaluation Review, 1982
Two methods for dividing an interrupted time-series study between baseline and experimental phases when study resources are limited are compared. In fixed designs, the baseline duration is predetermined. In flexible designs the baseline duration is contingent on remaining resources and the match of results to prior expectations of the evaluator.…
Descriptors: Data Collection, Evaluation Methods, Evaluators, Research Design
Peer reviewedLanza, Marilyn Lewis; Carifio, James – Evaluation Review, 1992
The validity of vignettes used to elicit subject responses in social science research is examined in a study of the validity of a group of patient assault vignettes seen by 12 persons with experience in patient care. A model for establishing the validity of vignettes is proposed. (SLD)
Descriptors: Construct Validity, Data Collection, Evaluators, Models
