Template:Example: Published 2P Weibull Distribution Complete Data RRY Example: Difference between revisions

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==Weibull Distribution Example 15: 2-Parameter with RRY==
#REDIRECT [[Weibull Distribution Examples]]
 
From Dimitri Kececioglu, Reliability & Life Testing Handbook, Page 418 [20].
 
Sample of 10 units, all tested to failure. The times-to-failure were recorded at 16; 34; 53; 75; 93; 120; 150; 191; 240; and 339 hours.
 
===Published Results for Weibull Distribution Example 15===
 
Published Results (using Rank Regression on Y):
 
[[Image:example15formula.png|center]]
 
===Computed Results for Weibull Distribution Example 15===
 
This same data set can be entered into Weibull++ 7 by selecting the Times to Failure type. Use RRY for the estimation method.
 
Weibull++ computed parameters for RRY are:
 
[[Image:example15formula2.png|center]]
 
The small difference between the published results and the ones obtained from Weibull++ is due to the difference in the median rank values between the two (in the publication, median ranks are obtained from tables to 3 decimal places, whereas in Weibull++ they are calculated and carried out up to the 15th decimal point).
 
You will also notice that in the examples that follow, a small difference may exist between the published results and the ones obtained from Weibull++. This can be attributed to the difference between the computer numerical precision employed by Weibull++ and the lower number of significant digits used by the original authors. In most of these publications, no information was given as to the numerical precision used.

Latest revision as of 02:16, 14 August 2012

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