Basic Analysis and Graphing - SAS

Chapter 4 Performing Bivariate Analysis 99
Fit Line and Fit Polynomial
Fit Line and Fit Polynomial
Using the Fit Line command, you can add straight line fits to your scatterplot using least squares regression.
Using the Fit Polynomial command, you can fit polynomial curves of a certain degree using least squares
regression.
Figure 4.8 Example of Fit Line and Fit Polynomial
Figure 4.8 shows an example that compares a linear fit to the mean line and to a degree 2 polynomial fit.
Note the following information:
• The Fit Line output is equivalent to a polynomial fit of degree 1.
• The Fit Mean output is equivalent to a polynomial fit of degree 0.
Linear Fit and Polynomial Fit Reports
The Linear Fit and Polynomial Fit reports begin with the equation of fit.