Before you can calculate a Passer's Pedder Passer Rating,you
must first have league-total statistics for all the years that he played. You
can do this for any player,in any league (N.F.L.,C.F.L.,college,etc.),as long
as you have the league-total stat's for those years.
The P.P.R. formula is....
Completions * Yards / Attempts^2 * Touchdowns / Intercepts
(completions times yards divided by attempts squared *touchdowns/intercepts)
To calculate a Passer's P.P.R.,do the following...
1. use the Passer's figures in the formula,to get the Rated Passer Figure (RPF) - a.k.a. the Raw Passer Figure
2. use the league-total figures,to get the Rated Average Figure (RAF)
3. PPR=RPF/RAF*100
4. Done! :-)
Example
This is how Steve Young's 1997 P.P.R. was arrived at....
com att yds TD int
Steve Young's 1997 numbers - 241 356 3029 19 6
1997 N.F.L. totals - 8844 15729 105298 617 479
( 241 * 3029 / 356^2 * 19 / 6 ) R.P.F.
/ (8844 * 105298 / 15729^2 * 617 / 479) R.A.F.
* 100
= 376.2 (to 4 significant figures) P.P.R.
A Passer whose P.P.R. is above 100,is above average,and a
figure BELOW 100,means that he is below average. Note that this is a comparison
to other players OF HIS LEAGUE,amd OF HIS ERA. The Rated Average Figure is
exactly that - a figure that represents the average abilities of the era in
question. A Passer who is above 100 is not "above average" compared to some
by-gone era,but it TRULY above average.
Further to the above,if you wanted to find out (on "average"),how
far ABOVE average the player is,divide the figure by 100 (making "1" the base
average again),and take the 4th root (the square root of the square root).
If you end up with "1.10" (equivalent to a P.P.R. of 146.4),then
that means he is typically above average,in EACH category,by 10% (1.1^4*100=146.4)
Taking the 4th root has been left out (along with some other
things),in order to keep the whole process as SIMPLE as possible (and it
doesn't change the RANKINGS that result). Note how this simplicity contrasts
with the N.F.L's Passer rating system.
If you have "average" figures (i.e. not totals) then,in
place of the above formula,use completion percentage (expressed as a decimal
fraction of 1) squared,times yards/completion,times TD%/int%.
...or completion percentage (as fraction of 1),times
yards/attempt,times TD%/int%.
For an explanation of the THEORY to all this,go to......
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