Das Journal of Retailing (ERIM P: Impact Factor: 5.873) hat den Artikel von Jannik Wolters und Prof. Dr. Arnd Huchzermeier über Joint In-Season and Out-of-Season Promotion Demand Forecasting in a Retail Environment angenommen. Der Artikel wird in der Sonderausgabe zu Metrics and Analytics in Retailing erscheinen. Die Autoren bedanken sich für die Diskussionsrunden und die zur Verfügung gestellten Daten bei Herrn Marcel Uphues, ehemaliger Finanzdirektor, und Herrn Stefan Länge, Hauptabteilungsleiter Customer Information Management, vom Einzelhändler Real.
Title: Joint In-Season and Out-of Season Promotion Demand Forecasting in a Retail Environment
Abstract: Inaccurate forecasts of demand during promotions diminish the already meager proﬁt margins of retailers. No forecasting method described in the literature can accurately account for the combination of seasonal sales variation and promotion-induced sales peaks over forecasting horizons of several weeks or months. We address this research gap by developing a forecasting method for seasonal, frequently promoted products that generates accurate predictions, can handle a large number of sales series, and requires minimal training data. In our method’s ﬁrst stage, we forecast the seasonal sales cycle by ﬁtting a harmonic regression model to a decomposed training set, which excludes promotional and holiday sales, and then extrapolate that model to a testing set. In the second stage, we integrate the resulting seasonal forecast into a multiplicative demand function that accounts for consumer stockpiling and captures promotional and holiday sales uplifts. The ﬁnal model is then ﬁtted using ridge regression. We use sales data from a grocery retailing chain to compare the forecasting accuracy of our method with popular seasonal and promotion demand forecasting models at multiple aggregation levels for both short and long forecasting horizons. The signiﬁcantly more accurate forecasts generated by our model attest to the merit of the approach developed here.
Key words: demand forecasting, seasonality, price promotions, retailing