Tatsiana BandziukRetail & Fashion Analytics
Assortment7 min read

How to Build a Size Curve from Last Season’s Sales Data

Why raw sales make a misleading size curve, and the three cleaning steps that fix it.

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Why Raw Sales Data Gives a Wrong Size Curve

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Three Steps to Clean Sales Data Before Calculating a Size Curve

  • Remove weeks where the size was out of stock.
  • Use net sales after returns.
  • Exclude promotion weeks with unusual demand.

Size Curves per Market and Category

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