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Intervention2
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Educational and Psychological…1
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Bretschneider, Stuart I.1
Huitema, Bradley E.1
Mandell, Marvin B.1
McKean, Joseph W.1
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Design Specification Issues in Time-Series Intervention Models.
Peer reviewed Peer reviewed
Huitema, Bradley E.; McKean, Joseph W. – Educational and Psychological Measurement, 2000
Presents examples of egregious errors of interpretation in time-series intervention models and makes recommendations regarding the correct specification of the design matrix. Discusses the profound effects of variants of the slope change variable in the design matrix. (SLD)
Descriptors: Intervention, Mathematical Models, Research Design
Using Exponential Smoothing to Specify Intervention Models for Interrupted Time Series.
Peer reviewed Peer reviewed
Mandell, Marvin B.; Bretschneider, Stuart I. – Evaluation Review, 1984
The authors demonstrate how exponential smoothing can play a role in the identification of the intervention component of an interrupted time-series design model that is analogous to the role that the sample autocorrelation and partial autocorrelation functions serve in the identification of the noise portion of such a model. (Author/BW)
Descriptors: Data Analysis, Evaluation Methods, Graphs, Intervention