Exponential Regression


The exponential regression option finds the equation of an exponential equation of the form y = abx or y = aebxthat best fits a set of data. First, press selecting option AEDIT to enter the data .



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 exponential regression, select option 09Rg_abx using followed by eight or select option 10Rg_aebx using followed by nine



Press and select one of the exponential regression options in the calculation screen. Now press followed by .



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

y = 11.78(1.133)x

which is equivalent to

y = 11.78(e0.125x)


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 .


Note: The Sharp calculates both the correlation coefficient r and the coefficient of determination r2.