a thoughtful web.
Good ideas and conversation. No ads, no tracking.   Login or Take a Tour!
comment by mk

I assumed that WSJ was a being a bit tongue-in-cheek.

That said, you could very well break the deal/sales into months rather than quarters and test correlation.

I'd say that the biggest problem here is that the time frame is too short. Junk Charts doesn't prove a strong point with their graph by reducing the time frame.

As far as seasonality, location, etc. It doesn't really matter when you are testing for correlation. Everyone knows that a reduction in pirates is highly correlated to global warming.