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Data fit tool issue

Valued Contributor
Valued Contributor

Dear community members,

I'm trying to use the data fit tool to estimate the distribution of interarrival times and I'm getting a problem:

when I go in the evaluation tab of tha distribution fitting tool, it always gives me the results for following distributions

 

Gumbel, Logistic, Cauchy, Laplace, Normal, Triangle, Uniform

 

But I want the results also of other distributions (beta, weibull, gamma). I already tried to select them in the fit tab -> distribution -> select, but when I click on "apply" it is like nothing happens and it gives me always the above distributions in the evaluation tab.

I'm I doing any mistake?

 

Thank you

3 REPLIES 3

Re: Data fit tool issue

Gears Esteemed Contributor Gears Esteemed Contributor
Gears Esteemed Contributor

if you don't see a distribution, then your data doesn't fit for it; you can have a look on your data, perhaps you have to delete some "outperformer" or failures

Steffen Bangsow
freelance simulation specialist  
web: www.bangsow.eu
mail: steffen@bangsow.net

Re: Data fit tool issue

Valued Contributor
Valued Contributor

I used the filter and now it gives me these output:

Cattura.PNG

The strange thing is that with another program I obtained as best fit a beta distribution multiplied by another variable.

Anyway, if I want to use the results in this table I should use the Weibull right? If so, how should I write the parameters in the source?

 

Thank you 

 

Re: Data fit tool issue

Gears Esteemed Contributor Gears Esteemed Contributor
Gears Esteemed Contributor

You should use Gumbel, it is the best fitting distribution, but you can also use Weilbull.

In the source, field interval select Gumbel and enter the parameters from the columns 13 and 14.

If you select the distribution, it is shown the order of parameters, you have to enter.

Steffen Bangsow
freelance simulation specialist  
web: www.bangsow.eu
mail: steffen@bangsow.net