We have discussed four possible outcomes of models. Which one was NOT one of them?

Yes, never heard of that, especially not in: Four Model Outcomes. Just to make sure, I just googled it: Google neither...

We studied possible outcomes of a model that represented the famous Lotka-Volterra predator-prey dynamics. If there were only self-replicating sheep, infinite grass, and no wolves, what kind of model outcome will you get?

Yes, there will be only sheep: Four Model Outcomes

We studied possible outcomes of a model that represented the famous Lotka-Volterra predator-prey dynamics. We used only three interdependent variables, including slowly growing grass, sheep that fed off grass, and wolves that fed off sheep. What kind of stylized model outcome did we observe when we set it in motion?

As sheep ate grass, grass decreased, but sheep increased, which fed more wolves, while grass recovered, etc. Please revisit the lesson: Four Model Outcomes

Your new employer works in the field of drone logistics. They are looking for the shortest possible route that visits each customer and returns to the origin. A college asks you to work on the analytical solution, while she will take care of the numerical solution. What do you start thinking about?

Yes, but you might not have to start from starch. This is a famous problem, known as the travelling salesman problem, and there are some analytical forms, such as the Miller-Tucker-Zemlin formulation and the Dantzig-Fulkerson-Johnson formulation: https://en.wikipedia.org/wiki/Travelling_salesman_problem

A computational social science colleague in your future job shows you two models that predict fake news. Both have the same size (their complexity is 184 lines of compressed code), and both achieve the same level of accuracy (an impressive 97.3%). One works to predict fake news on Facebook (Model A). The other one allows to predict fake news on all social media sites (Model B). Which one is better according to Occam's razor??

Yes, Model B also predicts fake news on Facebook (which is a social media site), so “ceteris paribus”, it must be shorter.

You have two models, model A describes the Facebook behavior of all girls (it consists of 5 lines of code), and model B describes the social media behavior of all women (it consists of 6 lines of code). According to Occam’s razor, which model should you prefer?

Yes, Occam’s razor is mute when the “ceteris paribus” condition is not fulfilled. Here one model explains more than the other.

You have two models, model A predicts consumer behavior with 75% accuracy (it consists of 5 lines of code), and model B predicts it with 90% accuracy (it consists of 6 lines of code). According to Occam’s razor, which model should you prefer?

Yes, Occam’s razor is mute when the “ceteris paribus” condition is not fulfilled. Here one model explains more than the other.

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