Basic question regarding CUSUM SPC Charts in JMP

[#1]

@martindemel

CUSUM charts in JMP are based on the target and the sigma values, which are being calculated by JMP. In my understanding, the target value is the mean and sigma is the standard deviation of the data set.

However, JMP generates values which are different to the mean and the standard deviation.

I'm wondering what JMP is exactly calculating. The following JSL shows the differences:

Names Default To Here( 1 );
Open(
	"$SAMPLE_DATA/Quality Control/Engine Temperature Sensor.jmp"
);
CUSUM Control Chart(
	Y( :Y ),
	Target( 100 ),
	Sigma( 10 )
);

Tabulate(
	Show Control Panel( 0 ),
	Add Table( Row Table( Analysis Columns( :Y ), Statistics( Mean, Std Dev ) ) )
)

Any in depth information’s are very well come. Thanks.

[#2]

Thanks Martin. I couldn't find this help page, where there is more information concerining the target and the sigma value. On the page:

https://www.jmp.com/support/help/en/16.1/#page/jmp/statistical-details-for-cusum-control-chart-const...

sigma is defined as:

σ is the standard deviation of the process

[#3]

Hi Thomas, in the link in my response above there is the information, however I put it here again: 

"control panel" in documentation search should lead you here as well