Compare quadratic and exponential regression

Press these keys

Walkthrough

1. 1
   Inspect shape first

   Use a scatter plot; do not choose a model only because its r² is high.

2. 2
   Run candidate model

   STAT → CALC → QuadReg or ExpReg with L1 and L2.

3. 3
   Check residuals

   After regression, residuals are stored in RESID; a residual plot should not show a systematic pattern.

Worked example