Test-Find-Test Data Reference Example

This example compares the results for test-find-test data.

International Standard IEC 61164 (Reliability Growth in Product Design and Test – Statistical Test and Estimation Methods), Example 4, pg. 32.

BetaBD (UnB) = 0.7472, LambdaBD = 0.0326

Unseen BD Mode Failure Intensity = 0.0030/hr

Goodness of fit for BD modes: CVM = 0.085, critical value = 0.171 with significance level = 0.1. Since CVM < critical value can fail to reject hypothesis that the model fits the data. DMTBF = 88.9 hours PMTBF = 135.1 hours

Since test-find-test, the assumption is $$\,\!\beta =1$$. Therefore:


 * $$\begin{align}

DMTBF=&\frac{T}{N}\\

=&\frac{4000}{45}\\

=&0.6153 \end{align}\,\!$$