Modeling and Multivariate Methods - SAS

322 Recursively Partitioning Data Chapter 13
Partition Method
Figure 13.6 Second Split
The 430 observations from the previous left leaf are now split into two parts:
• A left leaf, corresponding to lstat ≥ 14.43, has 175 observations.
• A right leaf, corresponding to lstat < 14.43, has 255 observations.
The 506 original observations are now split into three parts:
• A leaf corresponding to rooms < 6.943 and lstat ≥ 14.43.
• A leaf corresponding to rooms < 6.943 and lstat < 14.43.
• A leaf corresponding to rooms ≥ 6.943.
The predicted value for the observations in each leaf is the average response. The plot is divided into three
sections, corresponding to the three leafs. These predicted values are shown on the plot with black lines. The
points are put into random horizontal positions in each section. The vertical position is based on the
response.