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New ARRAYRANK Builtin Sorts Array Values
Version 9.1.2 will introduce the ARRAYRANK feature. Here is a preview of its capabilities. The ARRAYRANK built-in can be very powerful for some applications. It allows you to order the values in an...
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A Better Chained Slider
Chained slider in iThink 9.1.2 The chained slider has always been a useful interface object in iThink and STELLA for allocating 100% of something to different variables within a model. For example,...
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Insight-based Model Investigates the Housing Crisis
For the past few months I’ve been taking a distance learning course at WPI called “System Dynamics Foundations: Managing Complexity”. The course covers a broad range of topics about the system dynamics...
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Version 9.1.3 Updates Key Features
We just released another update to STELLA and iThink — Version 9.1.3. This particular release has a number of updates specific to key features. For example, if you’re a Macintosh user and rely on the...
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Success to the Successful
My first introduction to the Systems Archetypes was years ago when I read Peter Senge’s book, The Fifth Discipline. I remember relating these classic Systems Thinking stories to my own experience in...
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Modeling H1N1 Flu Outbreak
It seems like everyone has been talking about H1N1 (swine flu) the last couple of months. If you have children in school, then you are probably very aware of how fast the virus is spreading. Schools...
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Limits to Growth
This is the first of a three-part series on the Limits to Growth Archetype. The second part can be accessed here and the third part here. The Limits to Growth Systems Archetype, also known as Limits...
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Developing a Market Using the Bass Diffusion Model
This is part two of a three part series on Limits to Growth. Part one can be accessed here and part three can be accessed here. In part one of this series, I explained the Limits to Growth archetype...
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Modeling Bass Diffusion with Rivalry
This is the last of a three-part series on the Limits to Growth Archetype. The first part can be accessed here and the second part here. Last time, we explored the effects of Type 1 rivalry (rivalry...
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What is the difference between STELLA and iThink?
The question we get asked most frequently by just about anyone who wants to know more about our modeling software is “What is the difference between STELLA and iThink?” From a functional perspective,...
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Connecting iThink and STELLA to a Database
A question we periodically get from our customers is: Can iThink or STELLA connect to a database? Saving and pulling information to/from databases presents a lot of advantages for storing, organizing...
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Generating Custom Reports Using XMILE
XMILE is an open standard for describing system dynamics models in XML. Version 10 of iThink and STELLA output their models in the XMILE format. One of the advantages of XML is that it is a...
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Generating Random Numbers from Custom Probability Distributions
STELLA® and iThink® provide many useful probability distribution functions (listed here). However, sometimes you need to draw random numbers from a different probability distribution, perhaps one you...
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