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680 Analysis
Stat::Fit (Windows only)
an appropriate distribution to represent it. There are two advantages to using statistical distri- butions rather than raw historical data as inputs to a model:
• Values for input random variables are not limited to what has happened historically.
• Forcontinuousdistributions,aninfinitepoolofdataexists.Withhistoricaldata,thereissel- dom enough collected data to support multiple simulation runs.
Stat::Fit is a software package from Geer Mountain Software (www.geerms.com) that helps the analyst determine which distributions, if any, offer a good fit for the underlying data. ExtendSim has an interface so you can easily access the power of Stat::Fit.
☞ Stat::Fit is a Windows application included with the ExtendSim AT and ExtendSim Suite prod- ucts. It can be purchased separately for use with other ExtendSim products.
Tutorial
The StatFit Example, shown on the right, is a discrete event model. It has Stat::Fit choose a distribution for a Random Number block (Value library) using a pre-built text file of data.
By default, the Random Number block is set to the Uniform Real distribution with a Minimum of 0 and a Maximum of 1. The 32 historical data points in this project will be used by Stat::Fit to define which distribution and associated parame- ters might be more appropriate.
StatFit Example model
Open the StatFit Example model located in the folder \Examples\Tips\Modeling Tips. In the Distribution Fitting tab of the Random Number block, click Open Stat::Fit. The Stat::Fit application should appear on your screen with a new blank document.
Stat::Fit application window
In Stat::Fit, select File > Open.
How To
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