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Gasser Y avatar image
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Gasser Y asked Mischa Spelt commented

Statistical distributions parameters explanation.

I am working with a 5-workstation assembly line. Each workstation follows a different statistical distribution; Gamma, Normal, 3-parameter weibull, Largest extreme value and Smallest extreme value (which by the way I can't find in the statistical distributions in FlexSim).

The thing is, I only understand the parameters of the Normal distribution (Mean, Standard Deviation). But I have no clue of the rest of the parameters for the other distributions. Parameters are usually: Location, Scale, and Stream.

Can I get any help, please ? What is meant by each parameter, and what are the expected values to be entered ??

And, what can be the alternative for "Largest extreme value" and "Smallest extreme value" distributions ??

Thank you so much for your time and efforts.

Best Regards,
Gasser Yassen

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parametersstatistical distributiondatastatistical parameters
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Joerg Vogel avatar image
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Joerg Vogel answered Gasser Y commented

Some answers now; Stream is the parameter of the random number stream. Please look for yourself in the manual or the Google search of this site to get more information of the random number generator.

Location is a static offset of the distribution value you get. It adds the value to the distribution value.

Scale enhances or compresses the result of the normalized distribution.

The uniform distributions are set in the range of minimum to maximum extrem values. Please search in the command manual for the keyword uniform in the index pages.

Maybe you get a detailed answer later.

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Lou Keller avatar image
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Lou Keller answered

Hi Gasser, Please purchase and add to your library, two very important books. First, "Statistical Distributions, 4th Edition," by Evans, Hastings and Peacock, published by Wiley Press. They explain every aspect of every distribution you've mentioned and a whole lot more. And second, "100 Statistical Tests," by G. Kanji, published by Sage. In the interim, If you have any specific questions regarding any of the distributions, let me know and I'll fill you in! I used to teach under-graduate and graduate statistics so the discussion should be fun! My best, Lou

Oh, here are the URLs you need:

http://www.wiley.com/WileyCDA/WileyTitle/productCd-1118097823.html

https://books.google.com/books/about/100_Statistical_Tests.html?id=M-_WDH-06voC

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Sam Stubbs avatar image
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Sam Stubbs answered Mischa Spelt commented

Unfortunately I'm not a statistician, so I'm not sure I can explain the ins and outs of each distribution curve and how they work. But you can always get a more detailed explanation of each Flex Script command that you call. Any Flex Script command that you call (including any statistical distribution commands) you can get more info by selecting or highlighting the command, and pressing the 'F1' key on your keyboard. This will open up a detailed description in the command helper on the right side of your screen. It will display more information about the parameters required, and a more detailed description of what the command is and how it works.

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