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 monte carlo result on std dev and sigma 

Last post Thu, Jan 3 2013 9:29 AM by surreyian. 4 replies.
Started by surreyian 03 Jan 2013 07:53 AM. Topic has 4 replies and 1156 views
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  • Thu, Jan 3 2013 7:53 AM

    • surreyian
    • Top 500 Contributor
    • Joined on Tue, May 17 2011
    • Posts 19
    • Points 320
    monte carlo result on std dev and sigma Reply

    Hello,

    What is the differenence between sigma and std dev in monte carlo simulation. There two reading are not exactly the same, so what is the difference?

    • Post Points: 20
  • Thu, Jan 3 2013 8:07 AM

    Re: monte carlo result on std dev and sigma Reply

    Where are you looking at them? Which version? I just want to make sure I tell you the precise answer...

    Andrew.

    • Post Points: 20
  • Thu, Jan 3 2013 8:17 AM

    • surreyian
    • Top 500 Contributor
    • Joined on Tue, May 17 2011
    • Posts 19
    • Points 320
    Re: monte carlo result on std dev and sigma Reply

    Hello Andrew,

    In ADE-XL in result tab, pull down menu "summary"  gives std dev reading, and "yeild" shows sigma reading

    using MMSIM11.1-ISR17, IC615-ISR12

     

    • Post Points: 20
  • Thu, Jan 3 2013 8:48 AM

    Re: monte carlo result on std dev and sigma Reply

    sigma on the Yield tab is the sample standard deviation (which is the same as the "sd" annotated on the histograms), whereas std dev on the Summary tab is the population standard deviation.

    I'm sure you remember the difference from school maths, but if not, it's covered on http://en.wikipedia.org/wiki/Standard_deviation

    Given that you are using a sample of the points, the sample standard deviation is the one you normally want. With a sufficiently large number of samples, the difference is small (because the sample uses a denominator of N-1 and population uses a denominator of N, so if N was 1000, it would be roughly 0.1% different).

    Regards,

    Andrew.

    • Post Points: 20
  • Thu, Jan 3 2013 9:29 AM

    • surreyian
    • Top 500 Contributor
    • Joined on Tue, May 17 2011
    • Posts 19
    • Points 320
    Re: monte carlo result on std dev and sigma Reply

    that makes sense now. thanks andrew

    • Post Points: 5
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Started by surreyian at 03 Jan 2013 07:53 AM. Topic has 4 replies.