How to use least squares fit with bisquare weights

I am trying to fit a line/curve to a plot that looks quite noisy. I think it looks like a straight line or a very light curve. I read about least squares fitting with bisquare weights and I am trying that http://www.mathworks.com/help/curvefit/least-squares-fitting.html

Problem is I think the sample code doesnt provide the sample for the bisquare weights so im quite confused as to how I can implement it.

Answer 1

[KSSV]

You can use polyfit to fit your data. You can refer the following link: https://in.mathworks.com/matlabcentral/answers/27600-linear-fit.