p/u Charts or XmR Charts?
People ask: Should I use a p or u chart, or XmR chart? Which one is right? It depends…
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“Hi, I’m Jay Arthur, author of “Lean Six Sigma For Hospitals” and QI Macros [software].
“One of the things I’ve noticed is I get calls from people and they ask me, “Well, Jay, should we be using a p [chart] and u charts or an XmR chart of ratios?” And I can tell you: that depends on who your statistician leader is.
“If you’re looking at the Healthcare Data Guide, Lloyd Provost and his partner [Sandra Murray] love p and u charts… love them!
