Hazard rate

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The rate at which devices are failing referenced to the survivors (not to the initial number of units). Also known as instantaneous failure rate. h(t) = f(t)/R(t).

Cumulative hazard function
The fraction of units that have failed referenced to the survivors (not to the initial number of units). The value of this function at a specified time t₁ is given by the integral of the instantaneous failure rate (hazard rate), h(t), from t = 0 to t = t₁.
Instantaneous failure rate, h(t)
The rate at which devices are failing referenced to the survivors (not to the initial number of units). Also known as hazard rate. h(t) = f(t)/R(t).

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About Fred Schenkelberg

I am the reliability expert at FMS Reliability, a reliability engineering and management consulting firm I founded in 2004. I left Hewlett Packard (HP)’s Reliability Team, where I helped create a culture of reliability across the corporation, to assist other organizations.

About Fred Schenkelberg

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