Modeling and Multivariate Methods - SAS

Chapter 13 Recursively Partitioning Data 319
Partition Method
Decision Tree Report
As an example, use the Boston Housing.jmp data table. Launch the Partition platform and assign mvalue to
the Y, Response role. Assign all the other variables to the X, Factor role. If using JMP Pro, select Decision
Tree from the Method menu, then click OK. The initial report is shown in Figure 13.3.
Figure 13.3 Decision Tree Initial Report
The Split button is used to partition the data, creating a tree of partitions. Repeatedly splitting the data
results in branches and leaves of the tree. This can be thought of as growing the tree. The Prune button is
used to combine the most recent split back into one group.
Note the reported statistics:
RSquare
is the current R 2 value.
N
is the number of observations (if no Freq variable is used).
Number of Splits
is the current number of splits.
AICc
Count
Mean
is the corrected Akaike’s Information Criterion.
gives the number of rows in the branch.
gives the average response for all rows in that branch.
Std Dev
gives the standard deviation of the response for all rows in that branch.