To calculate an exponential regression, follow these steps.

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.