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649 Views 3 Replies Latest reply: Feb 19, 2001 12:00 AM by FredKohlhepp RSS
Copper 5 posts since
Jan 5, 2001
Currently Being Moderated

Feb 11, 2001 12:00 AM

Probablity plot

How do I plot a probablity graph, say,"%Failure Rate (FR)" vs. "time"; where FR is cumulative failure rate from say 0.000001% to 100%?
Thanks.
Homi.
  • sharoden Copper 20 posts since
    Feb 28, 2000
    Currently Being Moderated
    Feb 12, 2001 12:00 AM (in response to Anganit-disabled)
    Probablity plot
    For such a range of failure rates, you may want to consider a log plot of the failure rates, i.e., plot time on the x-axis in the normal linear fashion, and plot the log(base 10) of the failure rate or cumulative failure rate (written as either a discrete summation of failures with sigma or an integral if you have established a function of the failure rate as a function of time).

    If this doesn't help, post a sample of your data and it can easily be demonstrated. Hope this helps.
      • FredKohlhepp Platinum 1,664 posts since
        Nov 28, 2006
        Currently Being Moderated
        Feb 19, 2001 12:00 AM (in response to Anganit-disabled)
        Probablity plot
        MathCad 8 lists four functions:

        dweibull(x,s)
        pweibull(x,s)
        qweibull(p,s)
        rweibull(m,s)

        Information in the manual is scarce; I expect that there are quick sheets on the subject.


        Fred Kohlhepp
        fkohlhepp@sikorsky.com

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