Does anybody know a reliable source for learning statistical models of studying demand and sales of products?

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Rupert W Leong

YouTube. Seriously. It's free and good place to start for anything in stats.

Aleksandr Blekh

I would start with Wikipedia: http://en.wikipedia.org/wiki/Supply_and_demand#Empirical_estimation and http://en.wikipedia.org/wiki/Econometrics. Then I would do an Internet search for research papers on your keywords (statistical, models, demand, sales) and read papers referenced there. Hope it helps.

Here's more information: http://pairach.com/econR. If you use R for your research, it's a "gold mine" :-). Good luck! (This site also has Twitter account "Econometrics with R" - see details on the home page.)