“Cumulative Sums of the Poisson” – affectionately called the “Thorndike Chart”

Share This Post

An old Nomograph that can save Risk Analysts and Reliability Engineers a lot of time: “Cumulative Sums of the Poisson” – affectionately called the “Thorndike Chart”

If you ever had to explain to a customer that the expected number of “catastrophic” events over the next (say) 10 years is a small fraction < 1. ..(say 0.26 events).. Using the Thorndike chart you can see that using µ=0.26, the Probability of seeing 1 (or more) events over the same time period is 0.24. Much easier to explain to a customer than 0.26 “expected” events!! Thorndike Chart

Previously published in the June 2013 Volume 4, Issue 2 ASQ Reliability Division Newsletter

More To Explore

General

ASQ Statistics Division – Ellis R. Ott Scholarships

Ellis R. Ott Scholarship for Applied Statistics and Quality Management Deadline: April 1 For more information about the program and last year’s winners, see Ellis R. Ott Scholarship Provides $7,500 to ‘Quality’ Students | Amstat News. Criteria for Selection – Applicants must be students planning to enroll or currently enrolled in a Master’s degree or

General

RMMR 2023 – Reliability, Maintenance & Managing Risk Conference

We invite you to submit abstracts for the presentations at the 3rd Annual Reliability, Maintenance & Managing Risk Conference (RMMR2023) to be held on July 27-28, 2023 (with pre-conference courses to be offered on July 26), in Minneapolis, MN.  RMMR2023 is sponsored by the American Society for Quality (ASQ), Reliability and Risk Division (RRD).  It

Scroll to Top