Stats and analysis are far less important for me than the act of tracking. Knowing that I'm accountable for my decisions makes me much more likely to make positive choices. For example, I've been trying to cut back on coffee. Knowing that I drink 1.2 or 0.8 coffees per day has far less of an impact on me than knowing that at the end of the day I'm going to have to go in and check "Yes" next to my coffee item. It sounds ridiculous, but it works.
Sebastian Marshall has written extensively about life tracking, which is how I originally got into it. His What Gets Measured Gets Managed post is an excellent primer:
http://www.sebastianmarshall.com/what-gets-measured-gets-man...