Neil:
I have a class that I sometimes give for instrument techs that uses exactly
this analogy.
Russ, #1226B
PS- what I'm most concerned about is the "gun" that shoots a tight group in
the first ring one day, and a tight group in the fourth ring the next day.
You can't hunt with a gun like that. And you can't improve your LSR effort
with that kind of data, either.
-----Original Message-----
From: Albaugh, Neil [mailto:albaugh_neil@ti.com]
Sent: Friday, May 09, 2003 5:24 PM
To: 'Russel Mack'; 'John Goodman'; 'land-speed@autox.team.net'
Subject: RE: The concept of Data?
Russ, et al;
One way this difference between "accuracy" and "precision" can be
illustrated is to visualize a bulls-eye target.
Lots of holes tightly grouped over in one corner of the target represents
"precision"; Holes all over the target but centered on the bulls-eye is
"accuracy". If the measurement has precision but not accuracy, the error can
be calibrated out. The only way to deal with accuracy without precision is
to average a large number of samples; if the error is truly random, it will
average to zero.
Regards, Neil Tucson, AZ
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