Home Depot cutting promotions

Home Depot announced that they are cutting back on unproductive promotions:

"We learned that numerous promotions were not providing sales lift, and therefore have reduced unproductive promotions," Craig Menear, Home Depot executive vice president of merchandising, said during the home improvement industry leader's analyst meeting ...

I'd like to know more about their data and analysis, but that's pretty much all the article says. It's so frustrating sometimes, when an article in the general media touches, ever so lightly, on a subject of interest to me, and then moves on.