Diagram and simulation of disease spread

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There is much we can learn from the development of qualitative relationships models though once we begin to ask questions like how long, how much, when, etc., a qualitative most is not likely to be of much use. The following video demonstrates how, in a very simple goal-seeking structure with delay, depending on the delay, it can be almost impossible to intuit the implications of the interactions with any level of accuracy. The difficulty arises essentially from operating with outdated data. See also Archetypes.

Video

This model is part of

And? Understanding Relationships & Their Implications.

Goal Seeking with Delay

Gene Bellinger

Simulating Hyperinflation for 3650 days.

If private bond holdings are going down and the government is running a big deficit then the central bank has to monetize bonds equal to the deficit plus the decrease in private bond holdings. We don't show the details of the central bank buying bonds here, just the net results.

See blog at http://howfiatdies.blogspot.com for more on hyperinflation, including a hyperinflation FAQ.

Hyperinflation Simulation

Vincent Cate

Here we have a basic SEIR model and we will investigate what changes would be appropriate for modelling the 2019 Coronavirus

SEIR Infectious Disease Model for COVID-19

Rolf Häsänen

606

This is a food chain of BIOTIC factors. They are animals or plants that have been alive or are alive. Dead rodents or bacteria are both biotic factors. Food webs are 100% consisted of biotic factors.

Mountain Food Web

Ben Janke

When deferred requirements pile up and underestimated complexity surround a project, managers end up riding a bow wave of schedule and delivery complications. From William E. Novak and Linda Levine CMU SEI Sept 2010 Success in Acquisition: Using Archetypes to Beat the Odds paper and see webpage

Bow wave effect