## Constant control limits over Phases in Xbar charts

Community Trekker

Joined:

Jun 23, 2011

Using JMP 8.0.2.2 on Windows XP:

I'm trying to generate xbar charts with constant control limits over numerous phases. The following code snippet will shows how I am currently doing this, but to add a phase requires changing the code. I just want constant control limits over all phases. Is there something I can do within the xbar chart or should I start thinking about this differently?

Control Chart(
Phase( :Phase ),
Sample Label( :Batch ),
Chart Col(
:Measurement,
XBar(
Phase Level( "Phase Level 1", LCL( 1 ), UCL( 3 ) ),
Phase Level( "Phase Level 2", LCL( 1 ), UCL( 3 ) ),
Phase Level( "Phase Level 3", LCL( 1 ), UCL( 3 ) ),
)
)
);