Case Study 8—Interrupted Time Series Analysis, Holdback Forecasting, and Variable Transformation
In a breach of contract matter, we were contacted by the buyer's attorney to measure damages in a lost profits case allegedly caused by the seller's failure to disclose that six months after the closing a competitor would be opening a new market, the Bayside Supermarket, on March 1, 2007, just 10 miles down the road on State Highway 1. In these types of cases, the first task is to establish that the damaging event actually had a statistically significant impact on the buyer's monthly revenues, and that the decrease in revenue was not the result of mere chance.
Graph Your Data
We begin the process by scheduling actual monthly sales for the Ali-Baba Supermarket, LLC dba American Supermarket for the four-year period 2004 to 2007 in Table 8.1, and the accompanying line chart in Figure 8.1.
We investigated the possibility that the fall-off in sales that took place in 2007 also might have been suffered by the supermarket industry in the company's county and Economic Summary Area (ESA). A look at Table 8.2 refutes this idea, as the increase in sales for the county and ESA from 2006 to 2007 contrasts sharply with the reduction experienced ...