Hello Muhmmad,

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:

Statistics

Statistics Calculations

Tableau Blog:

5 Built-In Statistic Functions You Didn't Know Tableau Had

Tableau Whitepaper:

Advanced Analytics using Tableau

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!

Cheers!