total performance average?

Copied and pasted from an old post. Original poster is mentioned.

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You may be asking about the Accu-Stats Total Performance Average score. Here's my post about that from May, 2001:


From: Patrick Johnson ([EMAIL PROTECTED])
Subject: Accu-Stats "Total Performance Average" Scoring
Newsgroups: rec.sport.billiard
Date: 2001-05-26 22:47:41 PST

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When I received a couple of Accu-Stats tapes in the mail recently,
I also got a description of the Accu-Stats Total Performance
Average (TPA) scoring system, and since we were talking about it
recently, I thought I'd describe it for you. It's copyrighted
by Accu-Stats, but since they distribute it freely with their
tapes I'm assuming Pat Fleming won't mind it being shared here.


A player's Accu-Stats TPA is (almost) the percentage of error-free
shots made. I say almost because (1) an error may be committed
while pocketing a ball (position error), (2) a good safety isn't
counted in the percentage (only pocketed balls add to the score),
and (3) more than one error can be counted for a single shot
(see below). So, for instance, while a male pro may pocket 84
balls while committing 16 TPA errors (TPA = .840), his "real"
error-free shooting percentage might be higher or lower than 84%.


Errors are missing a clear shot, getting so out of line you miss
or play safe, scratching and playing an ineffective safety. A
miss and a scratch on the same shot counts as two errors.
Missing because of getting out of line counts as two errors.
Missing a shot easier than a spot shot counts as two errors.

Here's the official description of errors quoted from Accu-Stats:


> Definitions of the Five Possible Errors
>
> 1. MISS ERROR: A player can "see" the lowest ball on the
> table,and his primary concern is to pocket a ball, but he
> fails to do so. NOTE: A MISS THAT IS "EASIER THAN A SPOT
> SHOT" COUNTS AS TWO ERRORS.
>
> 2. BREAK ERROR: A player breaks, and the cue ball either
> goes into a pocket or off of the table.
>
> 3. KICK ERROR: A player cannot "see" the lowest ball on the
> table and is forced to shoot a rail first, masse', or jump
> shot, and fails to make a good hit.
>
> 4. SAFETY ERROR: A player plays a safety and his opponent
> pockets a ball during his next rurn at the table OR misses
> a shot that is easier than a spot shot. If, immediately
> after a safety, the opponent kicks the first ball in, no
> safety error will be charged.
>
> 5. POSITION ERROR: a. A player scratches in the pocket or
> off the table,excluding kicks and break shots.
> b. A player pockets at least one ball (not counting those
> on the break), but fails to win the game (rack). The
> exceptions to this is when one of the small notations ('n'
> or 'x') are used.


[NOTE: The "small notations" mentioned in error 5b indicate
missing an easy shot ('n') and playing a planned safety that's
not the result of getting out of line ('x').]


I like the idea of a scoring system that can be used to compare
players' abilities, and I appreciate Accu-Stats doing it, but I
think a simple "percent of error-free shots" score would be more
meaningful and the Definitions of Errors could be MUCH clearer.
For instance, what's the point of having scratches described as
three different errors (Break Error, Kick Error and Position
Error)?


Pat Johnson
Chicago

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