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  • $\begingroup$ At stats.stackexchange.com/a/160575/919 I have posted general advice concerning such questions. $\endgroup$ Commented Oct 20, 2016 at 18:37
  • $\begingroup$ Hi, I looked into that thread, I still have no idea. I dont understand what starting points mean. Ultimately what I need to do is find the 0.5 point in the Y axis and the corresponding value on the X axis. The solution will be somewhere between 600ms to 1400 ms and probably around the 1200ms mark. I have put the starting value as a vector from 600 to 1400 but, I have no idea whether that is right or what that means. I was hoping someone better equipped than me can help answer this problem precisely :). $\endgroup$ Commented Oct 20, 2016 at 18:58
  • $\begingroup$ You will greatly increase your chances of getting a specific response by (1) using standard terminology (math and English) rather than matlab code to specify the function, so that everybody will understand immediately what it means, and (2) formatting it clearly. $\endgroup$ Commented Oct 20, 2016 at 20:32
  • $\begingroup$ Hi whuber, thank you. I accepted the re-formating someone kindly did. I am not sure yet how to format the text in this forum - I am new here. About the question, I did give the matlab code, but I also explained the question, didn't I? $\endgroup$ Commented Oct 20, 2016 at 20:50
  • $\begingroup$ You have 4 parameters and 5 data points, which is not really enough data to reliably estimate the parameters. However your stated goal seems to be more about interpolating the $(x,y)$ points than anything to do with the parameters. Why not just fit a line? (Assuming you intended decimal points in the 2nd and 3rd $y$ data values, the data is pretty linear.) $\endgroup$ Commented Oct 20, 2016 at 21:16