Control charts for rare events

[VSht]

Hi,

There is a RAREEVENT procedure in SAS/QC, beautifully explained by Cat Truxillo in a video.

What resources are available for this in Base SAS or EG?

Thank you

[Rick_SAS · Accepted solution]

It is possible to do these computations and graphics without SAS/QC, but it requires that you understand the statistical methodology and the graphical techniques that are used. For many non-experts, this is a big learning curve, which is why they license SAS/QC to access these methods out of the box.

For example, look at the Getting Started example for the RAREEVENTS procedure. 

If you are familiar with the relevant statistics, you can do the following:

• Use PROC UNIVARIATE to fit a geometric distribution the the LAGs of the events.
• Use PROC SGPLOT to overlay the empirical lags and the expected lags.
• Use the CDF function in Base SAS and the formulas in the RAREEVENTS documention to  compute the control limits.
• Use PROC UNIVARIATE for the ECDF tests, if desired
• Use the BAND statement and the SERIES statement in PROC SGPLOT to create the plot.

[VSht]

Thank you Rick. This is a great instruction.