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Grouped per Configuration
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This example validates the results for grouped per configuration data in RGA.
Reference Case
MIL-HDBK-189C, Section 6.2.3.2, pg. 86, 2011.
For this example, the Crow-AMSAA (NHPP) model parameters will be calculated.
Data
The following table shows the data.
| Configuration Number
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Number of Failures in Configuration
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Number of Trials in Configuration
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| 1 |
5 |
14
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| 2 |
3 |
19
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| 3 |
4 |
15
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| 4 |
4 |
20
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Result
The book has the following results:
Beta = 0.780, Lambda = 0.595
| Configuration i
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Reliability for Configuration i
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| 1 |
0.667
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| 2 |
0.766
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| 3 |
0.794
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| 4 |
0.810
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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:
| Configuration i
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Reliability for Configuration i
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| 1 |
0.6668
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| 2 |
0.7662
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| 3 |
0.7939
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| 4 |
0.8096
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- The reliability vs. time plot:
