What is R^2 under quadriatic regressions on the TI-83? I know its the Coefficent of Determination, but what is that???? And how do I reach R^2 using pencil and paper?? is there an equation (no matter how complicated)??? ANYONE WITH ANY INFORMATION ON R^2 PLEASE EMAIL ME AT bell63@aol.com. I REALLY NEED AN EXPLANATION!!!! Thanks a lot!!! Mike