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Posts Tagged ‘Agent-Based Model’

Interview with Jennifer Sims

On August 20th, 2012 I interviewed JS to discuss her theory of adaptive realism and the intelligence community more generally. As with other interviews, our conversation was far reaching, open and discursive. Thus, the following summary presents several key points that came up in conversation rather than provide an exhaustive transcript of our exchange. Read the rest of this entry »

Computational Social Science Seminar Posted

Last Friday I gave a presentation on the challenges of strategic intelligence, and how Agent-Based Modeling fits within and can improve current analytic tradecraft. The slides have now been added to the website, and can be found on the Papers and Presentations page. The slides are somewhat sparse and are mostly talking points. There is a layer in the file that contains speakers notes that contain more information and bibliographic credit where graphics, quotes, and images were taken from other sources. Likewise, the abstract for the presentation can be seen on the Department of Computational Social Science website here. Read the rest of this entry »

Rock-Paper-Scissors and Arms Races Part 6

Previous posts had examined the replicator equation as the basis of agent behavior in an arms race defined by a game of rock-paper-scissors (RPS). This post begins a follow-on examination regarding the use of best-response as an alternative behavior or strategy on the part of competing agents. In some ways, best-response may be unrealistic with respect to how agents can adapt, especially if they are capable of making large jumps or changes to strategies in short-periods of time that are not reflective of real-world organizations. However, in other ways, the strategy is quite realistic for social actors because it affords them opportunities to revive dead or eliminated strategies when suitable while the biologically based replicator loses them forever once extinct. Read the rest of this entry »

Rock-Paper-Scissors and Arms Races Part 5

The last examination of the rock-paper-scissors (RPS) model added spatial considerations to the replicator equation, used as the basis for agent logic. Here, the outputs and responsiveness to geographic considerations are examined using the modified replicator equation discussed earlier. Read the rest of this entry »

The Use and Abuse of Models in International Security

Some days just appear to have a theme that constantly nags or colors everything that happens. It happens that yesterday was one of those days for me. I’m in the process of finishing up a project and I need to complete a book chapter on the validation of ABM based analysis for national security analysis. Importantly, the issue is less about the validation of the models themselves, and more concerned with whether or not analysts can use models for responsible inferences in support of decisionmaking. It also happened that the director of the Krasnow Institute where I work posted this on his own blog, and I came across this older piece in on the Wired website regarding some DARPA work that I’m familiar with. To add just a small piece more, a former government senior executive came to speak to my department yesterday about the challenges of ‘wicked problems’ in government, particularly in the design, development, and employment of new technologies and the difficulty of getting to work with the social structure of the government (building a new widget was rarely the difficult part). Read the rest of this entry »

Rock-Paper-Scissors and Arms Races Part 4

It has been a while, but I’m going to return to the Rock-Paper-Scissors (RPS) model that I started developing several weeks ago. This posting looks at the mechanics of of adding geography to the model, while a future posting will actually run the geographic version of the model—this posting is essentially a bridge between model assessments. Having already established that the agent-based framework can replicate the behavior of the equation based model, modifications to the ABM can add new features and relax assumptions embedded in the mathematical formalism, allowing for explorations that are increasingly relevant to the international system. Read the rest of this entry »

Rock-Paper-Scissors and Arms Races Part 3

This post extends the mathematical model of the Rock-Paper-Scissors (RPS) game analyzed in earlier postings (here and here). In order to overcome the limitations of the mathematical model, an Agent-Based-Model (ABM) was developed that contains the essential elements and assumptions of the original model. However, by changing the formalism, new opportunities to extend the model become possible. Read the rest of this entry »
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