THE BOOK--Playing The Percentages In Baseball

Have no doubt he will sooner rather than later.

I’m surprised you had never heard of him before, I’ve always been a fan of his.

MGL, I’m flattered. Thanks.

(Your check is in the mail.)

Jeremy’s been around for awhile.  Tango’s linked to him at least a few times here.

Sorry, this is a bit off-topic, but ... can anyone recommend a good algorithm for converting a range of numbers (eg from -20 to +20) into RGB hot/cold values (as in Jeremy’s graphs).

Finviz (http://www.finviz.com/groups.ashx?g=industry&v=310&o=name) has nice hot/cold industry charts, but only on two dimensions (hot = green, cold = red). A 0% change has an RGB value of 20/20/20, a +20% change would be 20/255/20, so only the green value changes. A +10% change would be 20/125/20. On the negative side, a -20% change would be 255/20/20, so only the red value changes. A -10% change would be 125/20/20.

Jeremy’s graphs work in three dimensions—red for hot, green for neutral and blue for cold. How do you convert a range of -20% to +20% into that colour scheme?

Dave Allen had a PowerPoint at this years pitch f/x summit about how to use R to make the heat graphs.

http://baseball.sportvision.com/summit/2009

Hey, let the kid graduate from college first (he’s with me at Tufts)! But seriously, Jeremy is going to be a treasure for whichever team he works for.