![]() A second dip around offset 180 initially puzzled us. With more data becoming available we plotted Yelp ratings further out in the future. Our original plot, limited by the data available to us at the time, only went out to offset 180. You can immediately observe a sharp discontinuity at offset zero coinciding with the day the deals were offered. The figure displays the running-average Yelp rating (reset on day zero) of about five thousand merchants who ran Groupon deals centered around their deal offer dates.
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