The quadratic regression option finds the equation of a quadratic equation of the form y = ax

The data shown here is the points {(2,11.4) (3,17) (5,27.3) (7,36.1) (11,47.7) (13,49.9)}

Press DREG to view the regression options.

For quadratic regression, select opton 04Rg_x

Press and select quadratic regression in the calculation screen. Now press followed by .

Therefore, the best-fit quadratic equation for this data is approximately

The regression equation can be automatically stored in the equation editor by entering the name of the equation, such as y1, after (L1,L2 as follows: choose option A and select y1 followed by .

The Sharp does not calculate the correlation coefficient r, but it does calcularte
the coefficient of determination, r^{2}.