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| The instantaneous MTBF and its two-sided 90% confidence intervals are: | | *The instantaneous MTBF and its two-sided 90% confidence intervals are: |
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| [[image:IEC 61164 Example 1 - Case 2_QPC.png|center]] | | [[image:IEC 61164 Example 1 - Case 2_QPC.png|center]] |
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| | | :The confidence bounds in QCP are calculated using Crow Bounds methodology. |
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Test-Fix-Test Data (Failure Terminated) Reference Example
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This example compares the results for test-fix-test data (failure terminated).
Reference Case
International Standard IEC 61164 (Reliability Growth in Product Design and Test – Statistical Test and Estimation Methods), Example 1 – Case 2, pg. 30.
Data
The following table shows the data.
| 2
|
| 4
|
| 10
|
| 15
|
| 18
|
| 19
|
| 20
|
| 25
|
| 39
|
| 41
|
| 43
|
| 45
|
| 47
|
| 66
|
| 88
|
| 97
|
| 104
|
| 105
|
| 120
|
| 196
|
| 217
|
| 219
|
| 257
|
| 260
|
| 281
|
| 283
|
| 289
|
| 307
|
| 329
|
| 357
|
| 372
|
| 374
|
| 393
|
| 403
|
| 466
|
| 521
|
| 556
|
| 571
|
| 621
|
| 628
|
| 642
|
| 684
|
| 732
|
| 735
|
| 754
|
| 792
|
| 803
|
| 805
|
| 832
|
| 836
|
| 873
|
| 975
|
Termination Time = 975 hours
Result
The book has the following results:
- Beta(UnB) = 0.5594, Lambda = 1.1067
- CL = 0.9 (two-sided confidence bounds on DMTBF)
- CVM = 0.041, critical value = 0.173. Since CVM < critical value can fail to reject hypothesis that the model fits the data.
Results in RGA
In RGA, the Crow-AMSAA (NHPP) model with the maximum likelihood estimation (MLE) method was used to calculate the results:
- The model parameters are:
- The instantaneous MTBF and its two-sided 90% confidence intervals are:
- The confidence bounds in QCP are calculated using Crow Bounds methodology.
