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

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?

Answer 1

[Jonathan Kwang]

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.