Store-Level Scanner Data: DFF provided weekly UPC-level
scanner data for all 88 stores in the chain for up to three years. The
scanner data includes unit sales, retail price, profit margin, and a
deal-code. Out of these 88 stores, five have limited historical data,
so we concentrate on the remaining 83 stores. To verify the correctness
of the data, comparisons across stores and categories were made for each
week. Certain weeks in which the integrity of the data was in doubt
were removed from the sample. Also one brand was introduced in the
early part of the data (Florida Gold), and another brand (Citrus Hill)
is removed in the later part. Consequently we consider the middle 121
weeks of the sample period (June 1990 through October 1992), to avoid
introduction and withdrawal effects.
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