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Tableau has some excellent statistical capabilities, the relevance of these to the retail industry I am not 100% on, but I will provide as much information on statistics in Tableau. I hope the below series of links, articles, and product helps will assist in your further development and understanding of Tableau.
Tableau On-Demand Training:
Finally, the Tableau Community group for Retail could be an excellent way of exploring methods of other Tableau users in the retail space, as well as a chance to collaborate and share tricks of the trade: Retail & Consumer Goods
I hope this helps!