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How does one define a sigmoidal function

  1. Jan 6, 2013 #1
    I am trying to model a 'perturbation function' and I finally arrive at a S-shaped graph,which I later found was called a 'sigmoid'. Is a sigmoid defined based on its inflection point? How does one classify a curve as a 'sigmoid'?
    Can i say that a certain function f is a sigmoid just because it has a S-shaped curve?What about skewed S-shaped curves?Are they sigmoids also?
    What are the constraints?
     
    Last edited: Jan 7, 2013
  2. jcsd
  3. Jan 7, 2013 #2

    jedishrfu

    Staff: Mentor

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