It is always a challenge to predict sales.
The idea in this chapter is to talk a little bit how to predict sales and try to explain some real codes to do it.
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Links:
http://stats.stackexchange.com/questions/46391/predict-sales-levels-with-decision-trees
https://github.com/mikeskim/Walmart/blob/master/makeSubmission.R
http://robjhyndman.com/talks/MelbourneRUG.pdf
http://www.slideshare.net/mattbagg/baggott-predict-customerinrpart1
https://www.otexts.org/fpp/using-r
http://blog.yantrajaal.com/2014/06/forecasting-retail-sales-linear.html