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Multiple Systems (Known Operating Times) Data Reference Example
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This example compares the results for multiple systems (known operating times) data.
Reference Case
MIL-HDBK-189A, Section 6.3.1.6.4, pg. 156, 2009.
Data
The following table shows the data.
Prototype #1
|
Prototype #2
|
Cumulative Time
|
*2.6 |
0 |
2.6
|
*16.5 |
0 |
16.5
|
*16.5 |
0 |
16.5
|
*17 |
0 |
17
|
20.5 |
*0.9 |
21.4
|
25.3 |
*3.8 |
29.1
|
28.7 |
*4.6 |
33.3
|
*41.8 |
14.7 |
56.5
|
*45.5 |
17.6 |
63.1
|
48.6 |
*22 |
70.6
|
49.6 |
*23.4 |
73
|
*51.4 |
26.3 |
77.7
|
*58.2 |
35.7 |
93.9
|
59 |
*36.5 |
95.5
|
60.5 |
*37.6 |
98.1
|
*61.9 |
39.1 |
101.1
|
*76.6 |
55.4 |
132
|
81.1 |
*61.1 |
142.2
|
*84.1 |
63.6 |
147.7
|
*84.7 |
64.3 |
149
|
*94.6 |
72.6 |
167.2
|
104.8 |
*85.9 |
190.7
|
105.9 |
*87.1 |
193
|
*108.8 |
89.9 |
198.7
|
132.4 |
*119.5 |
251.9
|
132.4 |
*150.1 |
282.5
|
132.4 |
*153.7 |
286.1
|
Termination Time = 300 hours
(* = system failed)
Result
The book has the following results:
- Beta = 0.716, Lambda = 0.454
- Using significance level = 0.05. CVM = 0.091. Critical value = 0.218. Since CVM < critical value can fail to reject hypothesis that model fits the data.
Results in RGA