Logistics Function

Logistics functions of the form

f(x) = a / [ 1 + b e - (x - c) / d ]

are explored along with the properties of their graphs.

Parameters a, b, c and d, defining function f are changed and their effects analyzed.

TUTORIAL

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1 - click on the button above "click here to start" and MAXIMIZE the window obtained. The graph of the logistics function is displayed.

2 - What happens to the graph of the function as x increases? Change parameter a and see what happens. Find an analytical explanation.

3 - Set parameters a, b and d to constant values and change c. What happens to the graph? Find an analytical explanation.

4 - Set parameters to constant values and change d. What happens to the graphs? Find an analytical explanation.

ANSWERS TO THE ABOVE QUESTIONS

2 - As x increases, f(x) approaches a constant value equal to parameter a. y = a is a horizontal asymptote.

3 - The whole graph is shifted to the right when increases and to the left when decreases.

4 - For small values of d, the graph changes rapidly. For larger values of d the graph changes slowly.


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Updated: 2 April 2013

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