How can i find uncertainty of coefficients ?

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Thar
Thar 2015-11-7
回答： Star Strider 2015-11-7
Hi all!
I have my data (x,y) and I plot these. Then I will do linear regression like:
p=polyfit(x,y,1);
yfit=polyval(p,x);
plot(x,y,'ob',x,yfit,'r');
gtext(['y=',num2str(p(1)),'x',num2str(p(2))])
I want to find the errors (or uncertainty) of coefficients a and b of the linear regression y=ax+b. How can i do this?
Thank you!

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回答（1 个）

Star Strider
Star Strider 2015-11-7
Since you’re using polyfit, use my FEX submission polyparci.

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