16
Advanced Keyboard/STATISTICS USING THE SHARP EL-9900
Copyright © 2002, Sharp Electronics Corporation. Permission is granted to photocopy for educational use only.
Steps for calculating other regression models
1. To find the best-fitting quadratic curve (y = ax
2
+ bx + c) for the data, press
STAT D (REG) 0 4 (Rg_x
2
) and press ENTER .
2. To view the overlay of the regression curve and the scatter diagram, press
Y= CL 2ndF VARS H (STAT) ENTER B (REGEQN) 1 (RegEqn) and
press GRAPH . The following overlay will be displayed.
Model of best fit
1. Notice, the r
2
value for the quadratic regression model is about .9337.
2. Whereas the r
2
value for the exponential regression model was .9786.
3. The exponential regression model (with the r
2
value closer to 1) is considered
the better-fitting model. The exponential regression model even fits better
than the linear model with an r
2
value of .8553.
4. Continue this analysis with other regression models.
OTHER REGRESSIONS (continued)
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