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S-Curve (Logistic Function) Calculator

areppim: information, pure and simple

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S-Curve (Logistic Function) Calculator

Welcome to areppim's Mathematics Calculator !

You want to forecast a growth function that is bound to hit a limit (S-Curve or Logistic function), and you have a fair estimate of what this limit could be. Just enter the requested parameters and you'll have an immediate answer.
[areppim's S-curve solution with 3 parameter estimates may get you a better curve fit.]

Enter your parameters :

Your known data
 Start time (period or year) :  End time (period or year) :
 Value at the beginning of the period :  Value at the end of the period :


Parameter estimate
 Saturation (upper limit) :


Span
 Forecast horizon (period or year) :

              

Instructions

  1. Known data :
    • enter the start and the end of the period for which you have data in the text fields next to "Start time (period or year)" and "End time (period or year)". Entries should be natural numbers not longer than 4 digits.
    • enter the known values at the beginning and at the end of the period in the text fields next to "Value at the beginning of the period" and "Value at the end of the period".
  2. Forecast :
    • enter the saturation value : your's own or the expert's upper limit estimate in the "Parameter estimate" text field.
    • enter the horizon time for your forecast in the text field next to "Forecast horizon (period or year)". Entries should be natural numbers not longer than 4 digits.
  3. To correct an entry, click the Reset button.

You may elect to walk through the following S-Curve example.

 

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