The Risks of Using Failure Rate to Calculate Reliability Metrics

The Risks of Using Failure Rate to Calculate Reliability Metrics

June 18th, 2017

Reliability HotWire is a monthly eMagazine by ReliaSoft providing information and tips on how to best improve your reliability practices and get the most out of ReliaSoft’s tools for reliability and life data analysis.


This Month’s Hot Topic

The Risks of Using Failure Rate to Calculate Reliability Metrics

A mistake that is often made when calculating reliability metrics is trying to use the failure rate function instead of the probability of failure function (CDF). These two functions, along with the probability density function (pdf) and the reliability function, make up the four functions that are commonly used to describe reliability data. In this article we will provide a brief overview of each of these four functions, followed by a discussion of how to obtain the pdf, CDF and reliability functions from the failure rate function. Finally, we will present an example of the error that can be introduced in unreliability calculations by using an approximation based on the failure rate.

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Register Today to Save – 2017 ARDC India

Make your plans to attend the Applied Reliability and Durability Conference (ARDC) fromAugust 9 – 11 in Pune, India. Register now until July 14th to receive a discount. This year’s symposium offers reliability and durability sessions along with discussion panels. For more information about the event, visit their website at

ReliaSoft Solutions at the ESREL Conference and ATE Expo

ReliaSoft will be exhibiting at the European Safety and Reliability Conference (ESREL) in Portorož, Slovenia on June 18 – 22, 2017 and at the Automotive Testing Europe Expo in Stuttgart, Germany on June 20 – 22, 2017.  If you’re not able to attend either event, you can learn more about ReliaSoft solutions at

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