LOGISTIC POPULATION MODEL

In this Logistic Population Model, we will demonstrate a simple systems dynamics model, which shows logistic population growth. This model adds in the value “k”

which is used to represent the carrying capacity.  We will demonstrate how this can be adjusted using a slider. This model can use a Chip, as well as two model layers,

in order to keep things organized — however, the Chip is not needed in this model and is used only for the purposes of demonstrating its potential.  The top layer,

“Demo” has sliders that allow users to adjust carrying capacity, initial population, and rate of growth. The bottom (or second) layer, “Logistic” contains  “in” and “out”

FLOWS that symbolize Births and Deaths.

 NEW COMPONENTS TO MODEL: The Chip (logistic_chip) signifies that the Top Layer, Demo, is taking in the Bottom Layer, Logistic, and conjoining the two layers of

the model.  You can add a Chip under the Code Chips section in the options on the bottom left of the Numerus platform.

** NOTE: The Chip is NOT mandatory in the Logistic Model; in fact, the model functions better without it.  However, the Chip is, as mentioned earlier, being

demonstrated in this simple model for users to better understand its purpose and apply that to the later, highly complex models. **

First / Top Layer of Model (Demo), with Chip:

Second / Bottom Layer of Model (Logistic):

Now, if you hit Launch, this may be one result of your model, but of course, model results will vary by data set.

WITHOUT Chip: