Evaluation of a Supermarket Intervention

Abstract
A 2-year supermarket intervention in 20 pair-matched stores tested whether a nutrition education program could produce changes in food purchasing behavior. Food sales data for 2 intervention years were compared with baseline year data. The evaluation presented challenges related to the quasi-experimental study design and to the high variability and auto- and cross-sectional correlations in the data. A complex time series model was used to take these factors into account and to test for intervention effects.

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