The HEIGHT statement specifies the name of a numeric variable to
define the height of each node (cluster) in the tree. The height
variable can also be specified by the HEIGHT= option in the PROC
TREE statement. If both the HEIGHT statement and the HEIGHT= option
are omitted, PROC TREE looks for a variable called _HEIGHT_. If the data
set does not contain _HEIGHT_, PROC TREE looks for a variable called
_NCL_. If _NCL_ is not found either, the height of each node is
defined to be its path length from the root.
- HEIGHT variable ;
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