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A multivariate procedure, based on the procedure outlined by Campbell and Stanely, is developed for inferring a treatment effect in the single-group, quasi-experimental time-series design. This procedure, which takes into account the dependent nature of the observations in the time-series experiment, is particularly suitable when the data exhibit linear trends. It is shown that the test statistic has a F distribution, and the procedure is illustrated with an example.
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Algina et al. (1977) studied this question.
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