Reader Questions Archives - Page 2 of 2 - Measures of Success

Question: Why are There so Many Data Points Outside of the Limits?

I got a message from a reader of my book Measures of Success: React Less, Lead Better, Improve More. The questions were: “I entered data from Press Ganey patient satisfaction responses (12-month running totals) and since the numbers were so close to each other, the PBC …

Question: How Can I Add More Data Points to a Process Behavior Chart?

A question that a few people have asked: “Your PBC template, by default, only shows 25 data points. How can I add more points to the chart?” I’ve made a YouTube video that shows how to do this in Excel: Here is my templates page, …

Question: Why Not Use Other Types of Control Charts? Why Not Use Standard Deviation?

A reader from Hong Kong asks a question that has been asked by others: “There are many types of control charts under the six sigma framework, depending on the data type (continuous/attributes). Do we need to consider it in crafting Process Behavior Charts?” Yes, university …

Question: When do we Recalculate the Limits in Process Behavior Charts?

A reader asked: “I am wondering at what point do you recommend recalculating the average and upper and lower limits?” Generally, we’d recalculate limits when there’s a signal that performance has shifted to fluctuate around a new average (evidence would be the “Rule 2” signal …

Question: Why is there a Scaling Factor for the Upper and Lower Natural Process Limits?

A reader question: “Mark, Thanks to your help, and some push from an IHI conference there is some pull in our organization for Process Behavior Charts. As we are putting together a template and training, we are looking for the stats behind the 2.66 and …

Question: What Should the MR-bar be?

This question also came from a webinar viewer: “How do you tell if a process is “controlled” or not? Is there a sort of max MR-bar to have in terms of % of the average or something? I mean, if the MR-bar is 100 for …

Question: Should I be Re-Evaluating the Average and Limits Every Time?

This question came from a webinar viewer: “You said that a minimum of 20 data points is a good place to start in order to have a realistic view of the process. What I was wondering is: Do you re-evaluate the average every time a …