Comparing the Standard and Modified Gompertz Models: Difference between revisions

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<noinclude>{{Banner RGA Examples}}
<noinclude>{{Banner RGA Examples}}
''This example appears in the [[Gompertz_Models|Reliability Growth and Repairable System Analysis Reference book]]''.
''This example appears in the [[Gompertz_Models|Reliability Growth and Repairable System Analysis Reference]]''.
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[[Image:rga7.8.png|center|400px|Standard Gompertz Reliability vs. Time plot]]
[[Image:rga7.8.png|center|400px|Standard Gompertz Reliability vs. Time plot]]


The standard Gompertz seems to do a fairly good job of modeling the data. However, it appears that it is having difficulty modeling the S-shape of the data. The modified Gompertz Reliability vs. Time plot is shown next. As expected, the modified Gompertz does a much better job of handling the S-shape presented by the data and provides a better fit for this data.
The standard Gompertz seems to do a fairly good job of modeling the data. However, it appears that it is having difficulty modeling the S-shape of the data. The modified Gompertz Reliability vs. Time plot is shown next. As expected, the modified Gompertz does a much better job of handling the S-shape presented by the data and provides a better fit for this data.
   
   
[[Image:rga7.9.png|center|400px|Modified Gompertz Reliability vs. Time plot.]]
[[Image:rga7.9.png|center|400px|Modified Gompertz Reliability vs. Time plot.]]

Revision as of 18:48, 29 May 2014

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This example appears in the Reliability Growth and Repairable System Analysis Reference.


Using the data in the following table, determine whether the standard Gompertz or modified Gompertz would be better suited for analyzing the given data.

Reliability Data
Stage Reliability (%)
0 36
1 38
2 46
3 58
4 71
5 80
6 86
7 88
8 90
9 91

Solution
The standard Gompertz Reliability vs. Time plot is shown next.

Standard Gompertz Reliability vs. Time plot

The standard Gompertz seems to do a fairly good job of modeling the data. However, it appears that it is having difficulty modeling the S-shape of the data. The modified Gompertz Reliability vs. Time plot is shown next. As expected, the modified Gompertz does a much better job of handling the S-shape presented by the data and provides a better fit for this data.

Modified Gompertz Reliability vs. Time plot.