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control charts in EG

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Contributor
Posts: 29

control charts in EG

I'm working on a project to draw control charts.

Ive generated output using PROC Shewhart Irchart but my variance changes significantly about 1/3rd of the way through the data.

Is there a way to have the limits self adjust when the variance changes? It looks like there may be a way of doing it in Shewhart but it is hard to tell for sure.

I've seen something about proc macontrol. I've tried copying the generated code in EG from shewhart and putting in the code for proc macontrol but so far it is not working
Contributor Jay
Contributor
Posts: 24

Re: control charts in EG

Yes there is a way.

Key words: READPHASES= and READINDEXES=

You may have to use these options in the code, I don't recall them being in an EG task. Conceptually you willl have two sets of control limits, one for phase one and another for phase two, etc. of the data.

This link will / should take you to the on-line documenation and an example:

http://support.sas.com/documentation/cdl/en/qcug/63922/HTML/default/viewer.htm#/documentation/cdl/en...
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