-----Original Message-----

From: Gabe Farkas [mailto:

gabefark@...]

Sent: Tuesday, January 04, 2005 5:54 PM

>Has anyone checked out Mr Cuban's latest blog entry:

>http://www.blogmaverick.com/entry/1234000790025973 ?

>

>Anyone want to take a crack at deciphering? I'm

>guessing that PER (or some permutation of it) is

>prominently involved....

From his description at the beginning, it sounds a lot

more like WinVal, or some version of it. But as for

the actual numbers, besides the points = offense-defense

calculation already explained, I don't know what's

going on with the other numbers.

Some guesses:

impact%: we know that Sagarin and Winston devalue

stats accumulated during garbage time, so this might

be a measure of what percent of a player's minutes

were non-garbage time, or perhaps an overall measure

of the non-garbage-ness of his overall minutes.

Minutes: my first guess is it's the player's minutes

played so far, this'd be easy to check but I'm rushing

through this

Z-score: Half of this is easy, a z-score in statistics

is the number of standard deviations that you are above

or below the mean, an often useful universal way (units

of measurement don't matter) of comparing different

observations, i.e. players. The more important half

though is: the mean of *what*? What is being measured

here? It might be the "points" variable, or it might

be a rawer +/- measure, or ? Actually, it's probably

not "points", see below.

PT_wins and ZS_wins: the numbers are far too high

to represent z-scores, but might represent some measure

of "wins produced" by the player (or by his typical

5-man lineup). I'm guessing one number represents

"wins produced" as estimated by "Points" and the other

as estimated by z-scores. Again, where these z-scores

and offense-defense calculations come from is not clear,

except probably from some sort of WinVal calculation.

PSalary$, ZSalary$, and Salary$: more mysteries.

Presumably some sort of salary calculation (maybe actual

salary, maybe "estimated" or "deserved" salary), as

calculated using "points" and "z-scores). Why the

Salary$ figures are all 0, and what they represent, is

a mystery to me.

Teamin: presumably team's minutes played, again it'd

be easy enough to verify this.

Age, Pos Ht: these are clear.

Algebra: the biggest mystery to me. And they're in

curly brackets. Maybe they represent a "wins produced"

calculation that comes more from theoretical algebraic

calculations, and which relies less of pure data.

+/-: Like z-scores, the general meaning is obvious,

but the specific calculation and meaning are unknown.

Does Cuban still use WinVal straight from Sagarin and

Winston, or has he turned to variations on it?

--MKT