PPWS: points per weighted shot
PPWS = PTS/(FGA + (0.475 x FTA))
PPWS is an odd name that I coined a couple years ago and applied to a stat created by John Hollinger. In effect, PPWS measures how efficiently a player translates field goal attempts and free throws into points.
In PPWS terms, anything over 1.30 is outstanding. (Players attaining this level of scoring efficiency are often twice-blessed: they had an unusually great year shooting threes and they had teammates occupying the attention of opposing defenses.) Among Big Ten players who logged at least 15 minutes per game, last year's average PPWS was 1.09. A PPWS under 1.00 indicates a player who really struggled to get the ball in the hole.
Additional reading. Last year I mused that PPWS "is a more reliable tool for criticism than for praise."
Now, I know most of you don't care about this sort of stuff, comparable in a way to sabermetrics in baseball, but I've kind of looked at it as pinpointing guys that'd help us by shooting more or less.
Effective FG pct. (eFG pct.--scroll down for 2005 figures)
eFG pct. = (FGM + (0.5 x 3PM))/FGA
About this stat....
A straight field goal percentage is fine as far as it goes (better than rebounds-per-game, certainly) but, since the advent of the three-point shot, it’s less informative than the following:
Effective FG pct. = (FGM + (0.5 x 3PM))/FGA
For instance—Illinois ranked second in the Big Ten last year in straight FG pct. in conference play:
Michigan State: .498 (431/866)
Illinois: .485 (432/890)
But, of course, the Illini attempted many more three point shots (351) than did the Spartans (283) and, as the old saying goes, making a third of your three-pointers is just as good as making half your two-pointers.
So the fact that Illinois shot .013 lower from the field than did Michigan State is misleading when unaccompanied by the additional fact that Bruce Weber’s team sank a very healthy share of those three-pointers:
Illinois eFG pct. = (432 + (0.5 x 145))/890 = (432 + 72.5)/890 = 504.5/890 = .567
Michigan State eFG pct. = (431 + (0.5 x 93))/866 = (431 + 46.5)/866 = 477.5/866 = .551
An eFG pct. merely recognizes mathematical reality: a made three-pointer is worth 0.5 more than a made two-pointer. Using a straight FG pct. in the presence of the three-point shot, then, is roughly analogous to calculating a batting average using plate appearances instead of official at-bats.