The logistic regression option finds the equation of the form

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 13Rg_logistic using followed by twelve

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

Therefore, the best-fit logistic 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 .