One of the amazing features of this web site is the Scorebook function. These stats you mention are available for courses with recorded rounds. The data is more fun at some courses than others but it's some pretty cool stuff.
People who use the Scorebook here on DGCR not only have the fun of their own personal stats, but also provide fun for other number geeks. If you ever thought it would be cool to have stats on your game and the courses you play, I'm here to tell you it's worth the effort of keeping hole by hole scores in your Scorebook. Record every round - good and bad - and you'd be amazed what a season of data can tell you.