Is it possible to extract also R^2 value from linear fit between 2 vectors ?

335 views (last 30 days)
Hello,
I know that it is possible to find fit parameters using polyfit command.
F.e., linearCoefficients = polyfit(x, y, 1)
Is it possible to extract also R^2 value from linear fit between 2 vectors ?
Thank you !

Accepted Answer

Star Strider
Star Strider on 14 Jan 2020
It is, however polyfit wil not do it for you.
Try this:
x = 1:10; % Create ‘x’
y = randn(size(x)) + 0.2*x; % Create ‘y’
linearCoefficients = polyfit(x, y, 1); % Coefficients
yfit = polyval(linearCoefficients, x); % Estimated Regression Line
SStot = sum((y-mean(y)).^2); % Total Sum-Of-Squares
SSres = sum((y-yfit).^2); % Residual Sum-Of-Squares
Rsq = 1-SSres/SStot; % R^2
  4 Comments

Sign in to comment.

More Answers (0)

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!