Number of Big East Schools Dancing?

[MEGAFAN]

I have a question about RPI.

First, I'm going to qualify this by stating that I'm a big fan of ignoring the stats and what not, and just winning games, at least until down to the very end of the season, when you have all the time in the world to analyze actually what happened, rather than the hypotheticals.

However, I would be lying if I didn't admit to checking kenpom.com, realtimerpi.com, collegepi.com, sagarin, etc. on a frequent basis.

Now, I know that the NCAA has a secret formula, almost as secret as Coca Cola's, but why do different sites list different rpi's, when they all claim to use the same formula. I realize that some sites may be using the old rpi, but for instance, realtimerpi.com llists our RPI as 51, whereas others lists us as lower. Check it out:

Kenpom RPI:
Georgetown 55
Pitt 52
WVU 49
Davidson 45

Realtime's RPI:
Georgetown 51
Pitt 50
WVU 54
Davidson 52

WarrenNolan RPI:
Georgetown 59
Pitt 51
WVU 50
Davidson 47

CollegeRPI:
(numbers outdated)

Do they all have their different take on RPI, in the sense that they used nuanced versions of the same formula, or what else is going on here?

Well, any way you slice it, we gotta just keep on winning. (We're gonna win the BET anyways, so don't sweat it too much, ha!)

LET'S GO HOYAS!!! BEAT 'NOVA!

[SFHoya99]

I know it sounds stupid, but there are a lot of ways to calculate RPI.

The basic --> .25*Winning % + .50* Opponents' W% + .25*Opponnents' Opponents W%.

Winning % Calculated as W/(W+L), where W = 1.4*away wins + .6*home wins and L = .6*away losses and 1.4*home losses.

Alright.

Now, some questions:

1) Does the 1.4/.6 weighting apply to opponents' W% and Opponents' Opponents' Winning %? Is Illinois' 28-0 adjusted for H-A?

2) Does the weighting as to where you played them factor into the Opponents' Winning %? That is, because we played them at home, does it not only count as .6 Losses for us, but does Illinois' 28-0 also get a .6 discount because we played them at home?

3) Is Opponent's W% a simple average of your opponents winng %? Or do you take all wins and losses and combine them? (i.e., if you played a 13-0 team and a 0-26 team, is your Opponents W% .500 or .333?)

I'm sure there are more questions when you actually start to calc it. And since the NCAA has never really been explicit...