# Math Help - Regression and correlation coefficient

1. ## Regression and correlation coefficient

Hello
I need to fit experimental data to mathematical models. The data fitted to these models had correlation (R) and regresion (R2) coefficients. What coefficient (R or R2) can i used to know which it is the best model?
Thanks!!

2. ## Re: Regression and correlation coefficient

Either. Given $R$, you can find $R^2$, and vice versa (given that you know whether the slope is positive or negative).