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Weibull Distribution beta parameter

Good Morning,

I have been working on setting up the attached weibull analysis spreadsheet in Excel.  My beta parameter result is 40 from the regression results .  This seems unrealistic, I was wondering if someone could take a look at what is attached and let me know if I have an issue, or if the file contains reasonable results.  Yes, this is the first time I've used Weibull analysis.

Thank you

aasikolo   Weibull.xls
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aasikolo
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aasikolo
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TommySzalapskiCommented:
If you want the cumulative distribution, then your numbers are fine. Try changing the TRUEs to FALSEs and see if that gives you what you expected.
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TommySzalapskiCommented:
Oh, your column labels are off though. Reliability is not 1-survivability.
Also, x is usually a time-to-failure, not a percentage.
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aasikoloAuthor Commented:
Tommy,

Thanks for the observations.  I didn't think that a beta parameter of 40 was valid.

As far as the column labels, take a look at this article:

http://www.qualitydigest.com/jan99/html/body_weibull.html

The percentage thing is a frequency, we're actually trying to find the reliability of a process producing something 70% of the time.

Your Thoughts?

Thanks

aasikolo
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aasikoloAuthor Commented:
Anything else you can provide would be appreciated - Thanks again.
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