Binomial Negative Distribution

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Jorge Manuel Garcia asked Oct 22, '16 Jorge Manuel Garcia answered Oct 24, '16

Binomial Negative Distribution

Hi everyone:

I have a variable that models the number of items sent by a source object. This number follows a negative binomial distribution with a mean value of 339 and variance value of 392.

I'm trying to customize the negbinomial() function but I can't find the correct values for the parameters ("number of successes" and "probability"). I can't find help in the manual and also searched in Wikipedia but I'm lost.

Any help would be appreciated!

Thanks :)

PD: To test if the parameters are ok, I use the experimenter, counting the number of items that are sent (once the number is reached, I close the sink's output).

EDIT: I attach a simple model to test it: negbinomial.fsm

Software Version:

FlexSim 16.2.1

distributions distribution parameters negbinomial

negbinomial.fsm (18.9 KiB)

5 |100000

Attachments: Up to 12 attachments (including images) can be used with a maximum of 23.8 MiB each and 47.7 MiB total.

Answer 1 · 2016-10-24T09:58:39Z

Jorge Manuel Garcia answered Oct 24, '16

I answer myself, I didn't notice that "probability" is a value between 0 and 100 (I was considering it to be from 0 to 1).

number of successes = mean^2 / (variance - mean)

probability = mean / variance

5 |100000

Attachments: Up to 12 attachments (including images) can be used with a maximum of 23.8 MiB each and 47.7 MiB total.

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