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Re: Preventing Financial Outbreaks [message #2000 is a reply to message #1986] |
Wed, 08 April 2009 13:23 |
Daniel Ford Messages: 148 Registered: July 2009 Location: New York |
Senior Member |
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I think you're asking if STEM is "agent" based or not. Not. It is "equation
based." It would be possible to create a kind of hybrid version of STEM in
which particular nodes in the graph had labels that were updated by the
results of separate agent based simulations.
--
Daniel Ford
IBM Almaden Research Center
San Jose, CA
"Miles Parker" <milesparker@gmail.com> wrote in message
news:grh0g2$o66$1@build.eclipse.org...
>
> Yes, there has also been quite a bit of work in financial contagion and
> similar effects in the ABM community. Here we'd model companies, traders,
> countries, etc.. as seperate actors with realtionship graphs and a set of
> boudedly rational rules. I'm not exactly sure how this docks to the STEM
> setup but it is beggining to sound similar. It is interesting how people
> in different communities slice a problem up in the same way but call it
> something different. Ecologists for example say "Individual-Bsed
> Modeling". And I sometimes I think a better name for Agent-Based modelling
> would be "disaggregate modelling"
>
> Daniel and others, would you characterize a typical STEM model as an
> equation-based vs. algorithmic-based (individual level) model? Is this a
> useful distinction to make? Is it somewhere in between? IOTW what does a
> typical graph node represent?
>
> On 2009-04-07 08:05:47 -0700, "Daniel Ford" <daford@almaden.ibm.com> said:
>
>> Nope, it's definitely not a "weired" idea. The way STEM maintains it's
>> model state in a graph and the way it sequences changes to the graph it
>> is
>> quote possible to "layer" different kinds of models with the lower level
>> models not being "aware" of the ones "above" them. For instance, it
>> would
>> be possible to create an economic model on top of an existing disease
>> model.
>> The economic model could reference the computations performed by the
>> disease
>> model and factor them into its own calculations.
>
>
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Re: Preventing Financial Outbreaks [message #560652 is a reply to message #1986] |
Wed, 08 April 2009 13:23 |
Daniel Ford Messages: 148 Registered: July 2009 Location: New York |
Senior Member |
|
|
I think you're asking if STEM is "agent" based or not. Not. It is "equation
based." It would be possible to create a kind of hybrid version of STEM in
which particular nodes in the graph had labels that were updated by the
results of separate agent based simulations.
--
Daniel Ford
IBM Almaden Research Center
San Jose, CA
"Miles Parker" <milesparker@gmail.com> wrote in message
news:grh0g2$o66$1@build.eclipse.org...
>
> Yes, there has also been quite a bit of work in financial contagion and
> similar effects in the ABM community. Here we'd model companies, traders,
> countries, etc.. as seperate actors with realtionship graphs and a set of
> boudedly rational rules. I'm not exactly sure how this docks to the STEM
> setup but it is beggining to sound similar. It is interesting how people
> in different communities slice a problem up in the same way but call it
> something different. Ecologists for example say "Individual-Bsed
> Modeling". And I sometimes I think a better name for Agent-Based modelling
> would be "disaggregate modelling"
>
> Daniel and others, would you characterize a typical STEM model as an
> equation-based vs. algorithmic-based (individual level) model? Is this a
> useful distinction to make? Is it somewhere in between? IOTW what does a
> typical graph node represent?
>
> On 2009-04-07 08:05:47 -0700, "Daniel Ford" <daford@almaden.ibm.com> said:
>
>> Nope, it's definitely not a "weired" idea. The way STEM maintains it's
>> model state in a graph and the way it sequences changes to the graph it
>> is
>> quote possible to "layer" different kinds of models with the lower level
>> models not being "aware" of the ones "above" them. For instance, it
>> would
>> be possible to create an economic model on top of an existing disease
>> model.
>> The economic model could reference the computations performed by the
>> disease
>> model and factor them into its own calculations.
>
>
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