Test-Fix-Test Data (Failure Terminated) Reference Example: Difference between revisions

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[[image:IEC 61164 Example 1 - Case 2_QPC.png|center]]
[[image:IEC 61164 Example 1 - Case 2_QPC.png|center]]
Confidence bounds in QCP are calculated using Crow Bounds methodology.

Revision as of 16:20, 9 June 2014

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Test-Fix-Test Data (Failure Terminated) Reference Example

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

Termination Time = 975 hours
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


Result

Beta (UnB) = 0.5594, Lambda = 1.1067

CL = 0.9 (two-sided confidence bounds on DMTBF

DMTBFUpper = 46.7 hours

DMTBF = 33.5 hours

DMTBFLower = 24.3 hours

CVM = 0.041, critical value = 0.173. Since CVM < critical value can fail to reject hypothesis that the model fits the data.


Results in Weibull++


IEC 61164 Example 1 - Case 2 Results.png


IEC 61164 Example 1 - Case 2 Stat Tests.png


IEC 61164 Example 1 - Case 2 QPC.png


Confidence bounds in QCP are calculated using Crow Bounds methodology.

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