How to estimate standard errors?

I'm using a code to estimate a hurst coefficient MFDFA procedure, Hurst coefficient is the slope of logFq(s) vs log(s) for q=2, i use polyfit function like this:

for nq=1:length(q),

C = polyfit(log2(scale),log2(Fq(nq,:)),1);

Hq(nq) = C(1);

Aq(nq)= C(2) ;

qRegLine{nq} = polyval(C,log2(scale));

end

How can i improve this estimation by giving also the error terms of Aq and Hq?

Bests

Answer 1

[tilfani oussama]

ALso my question is only about SE of coefficient estimated in the simple