To calculate an exponential regression, follow the steps below.

Data for this example:
L1: 0, 1, 2, 3, 4, 5, 6, 7
L2: 200, 118, 70, 40, 25, 15, 8, 4

1. Press m and press the right arrow key › to highlight CALC.
2. Press the down arrow key ≥ to option B: ExpReg or option C: eBaseReg (for base e regression model) and press =.
3. Make sure your XLIST and YLIST are in the wizard as expected, use the store RegEQ entry line to store the equation to the desired y-variable.
4. Select the softkey for CALCULATE by pressing d or f.