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

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

Posted in General
Webinar Categories
Recent Webinars
  • Leading Change Without Resistance
    October 12, 2017
    Register
  • The Function, the “Job To Be Done”, Not the Product!
    November 9, 2017
    Register
  • Coming soon
    December 14, 2017
    Register
Networking

Provide a global forum for networking among practitioners of reliability engineering, management and related topics.

Growth

Facilitate growth and development of division members,

Example

Provide Resources

Promote reliability engineering principles and serve as a technical resource on reliability engineering for ASQ, standards agencies, industry, government, academia and related disciplines

Training

Sponsor, present and promote reliability, maintainability, and related training materials for courses, symposia, and conferences.