[p,S] = polyfit(x,y,n); how to get S manually

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Sharah on 17 Jan 2017
Answered: Jonathan Kwang on 24 Jan 2017
I am trying to get the value of S same as the output from polyfit so that I can calculate the value of confidence interval using the polyconf function
My problem is I am not using the polyfit function, instead I use my own regression function (Total Least Square) instead of OLS. Can somebody show me how to get the S manually?

Accepted Answer

Jonathan Kwang
Jonathan Kwang on 24 Jan 2017
You can view the code for the polyfit function by typing the following in the MATLAB command window: >> edit polyfit
Then by viewing how "S" is created you can try to copy or adapt this code to fit your use.

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