MATLAB: How to get function expression for Cumulative distribution function

fit curvefunction expression

I have a cumulative distribution function(cdf). I have attached the figure. How can I fit the curve and get the function
 expression for it?

Best Answer

Likely the easiest way to estimate the parameters is with the Statistics and Machine Learning Toolbox fitdist function: 
x = randn(1, 25)*2 + 5;                                 % Create Data (Mean = 5, St Dev = 2)
b = fitdist(x(:), 'normal')
producing: 
b = 
  NormalDistribution
  Normal distribution
       mu = 5.30768   [4.42359, 6.19177]
    sigma =  2.1418   [1.67238, 2.97957]
Choose the appropriate distribution function for your data.
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