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Using least square to find the perfect fit of a figure

  1. Mar 30, 2013 #1
    1. The problem statement, all variables and given/known data
    Hello all,

    So I am working on my engineering project, and my professor told us to play with the graphs,and try to find something interesting about them.

    So what I want to do is form a better fit for the figure below. " figure 2b" , and find out why the choose not to do a better fit.
    However I am given all the constants " d1,d2,ca2+ " so I am not sure how to impliment least squares in this situation.

    Help would be appreciated

    5cj8le.png


    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Mar 30, 2013 #2

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    Those data points look ill, or there are error bars missing. I would try something like a (shifted) arctan, a logistic function or the error function.
     
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