Variables required to model a given system

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Modeling & Simulation[1]

In an examination students will not be expected to identify more than four variables in a given system.

Let's answer this question by looking at a few different systems and imagining which variables might be the most impactful.

a sports player[edit]

If I wanted to create a model of a sports player what variables might I choose? I want to choose a variables that are meaningful. Maybe:

  1. number of injuries
  2. age
  3. number of points scored
  4. number of games won
  5. number of games lost

I think these variables MIGHT help me model a sports figure.

a country[edit]

Maybe I wanted to create a model of a country. The variables I choose might be related to what I want to do with my model.

  1. percentage of population with electricity access
  2. electricity - consumption
  3. electricity - exports
  4. electricity - imports

These variable are used from the CIA world factbook with gratitude. I wonder why they create models of EVERY COUNTRY ON EARTH?

a car[edit]

I wonder how these variables might inform my choices about buying a car:

  1. total cost
  2. monthly average gasoline cost
  3. monthly repair cost
  4. monthly resale value


  • Identify the variables required to model a given system.