Failure rate
A measurement, in percentage, of the total
number of defects detected divided by the total
number of samples observed.
Example, if you have 50 defects out of 100 samples, then...
50 / 100 = 0.5 or 50% (percent).
This rate is associated with the acceptable
quality level, (AQL), and mean
time between failures, (MTBF), but may also be related to
mean time to failure (MTTF). Products could be tested using an accelerated
life test, (ALT). External
Failures are sometimes measured.
Also see Burn In,
Common Cause, and Special
Cause and Bathtub curve.
