Sinasiodal Regression


The sinasiodal regression option finds the equation of the form

y = asin(bx + c) + d


that 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 quadratic regression, select opton 14Rg_sin using followed by thirteen



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



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

y = 54.97sin(0.11x + 0.08) - 4.89


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- does not calculate the correlation coefficient r nor the coefficient of determination, r2.