Grouped Data Reference Example: Difference between revisions

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The falure rate vs. time plot:
*Failure intensity vs. time plot:


[[image:MIL-HDBK-189A 6.3.1.7.5 Example_Plot.png|center|550px]]
[[image:MIL-HDBK-189A 6.3.1.7.5 Example_Plot.png|center|550px]]

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Grouped Data Reference Example

This example compares the results for grouped data.


Reference Case

MIL-HDBK -189A, Section 6.3.1.7.5, pg. 162, 2009.


Data

The following table shows the data.

Failures in Interval Interval End Time
13 20
16 40
5 60
8 80
7 100
Termination Time = 100 hours


Result

The book has the following results:

  • Beta = 0.753, Lambda = 1.53
  • DMTBF = 2.6 hours
  • [math]\displaystyle{ \,\!X^{2} }[/math] = 5.5, critical value = 7.8 (Assume significance level = 0.1. Since [math]\displaystyle{ \,\!X^{2} }[/math] < critical value can fail to reject hypothesis that the Crow-AMSAA model fits the data).


Results in RGA

In RGA, the Crow-AMSAA (NHPP) model with the maximum likelihood parameter estimation (MLE) method was used to calculate the results:

  • The model parameters are:
MIL-HDBK-189A 6.3.1.7.5 Example Results.png


MIL-HDBK-189A 6.3.1.7.5 Example Stats.png


  • Failure intensity vs. time plot:
MIL-HDBK-189A 6.3.1.7.5 Example Plot.png
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