When I try to create a control chart on my data, I issue the following JSL
command:
Control Chart(Sample Label( :Name("Emul/Order")), KSigma(3), Chart Col(
:FTC_B, Individual Measurement(Avg(1.7), LCL(1.3), UCL(2.1))));
and lo and behold, I get the exact control chart I want, with centerline at
1.7, lower control limit at 1.3 and upper control limit at 2.1
Next, I try the following:
mean=1.7;
lcl=1.3;
ucl=2.1;
Control Chart(Sample Label( :Name("Emul/Order")), KSigma(3), Chart Col(
:FTC_B, Individual Measurement(Avg(mean), LCL(lcl), UCL(ucl))));
Guess what? My center line is no longer at 1.7, my lower control limit is
no longer at 1.3, and my upper control limit is no longer at 2.1.
Now, to my way of thinking, this is a bug, and also very undesirable.
Please try it on a suitable set of data and see what you get. Thanks!
--
Paige Miller
Eastman Kodak Company
paige.miller@kodak.com
(585) 477-2946
http://www.kodak.com
"It's nothing until I call it!" -- Bill Klem, NL Umpire
"When you get the choice to sit it out or dance, I hope you dance" -- Lee
Ann Womack
|