Basic Analysis and Graphing - SAS

Chapter 4 Performing Bivariate Analysis 121
Additional Examples of the Bivariate Platform
3. Select height and weight and click Y, Columns.
4. Click OK.
5. Hold down the CTRL key. On the red triangle menu next to height, select Save > Standardized.
Holding down the CTRL key broadcasts the operation to all variables in the report window. Notice that
in the Big Class.jmp sample data table, two new columns have been added.
6. Close the Distribution report window.
Use the Standardized Variables to Fit the Orthogonal Model
1. From the Big Class.jmp sample data table, select Analyze > Fit Y by X.
2. Select Std weight and click Y, Response.
3. Select Std height and click X, Factor.
4. Click OK.
5. From the red triangle menu, select Fit Line.
6. From the red triangle menu, select Fit Orthogonal. Then select each of the following:
– Equal Variances
– Fit X to Y
– Specified Variance Ratio and type 0.2.
– Specified Variance Ratio and type 5.
Figure 4.22 Example of Orthogonal Fitting Options
Fit X to Y
Fit Line
The scatterplot in Figure 4.22 shows the standardized height and weight values with various line fits that
illustrate the behavior of the orthogonal variance ratio selections. The standard linear regression (Fit Line)
occurs when the variance of the X variable is considered to be very small. Fit X to Y is the opposite extreme,
when the variation of the Y variable is ignored. All other lines fall between these two extremes and shift as
the variance ratio changes. As the variance ratio increases, the variation in the Y response dominates and the