What if no tree is grown?
A16. The most frustrating outcome is to learn that CART has apparently not grown a tree. In this circumstance you will obtain a Tree Sequence Summary, but no node detail and no analytical results beyond a variable importance ranking. Several solutions are available. If CART has apparently not grown a tree, several solutions are available: SOLUTION 1: PICK a Tree While you are still in BUILD, issue the PICK command to generate a tree from the tree sequence. Try something like: PICK NODES = 4 which produces an exploratory tree including all the standard output on node detail, learning sample cost statistics, and so on. Be aware, however, that CART has determined that no tree should be generated, and therefore that the predictive performance of your tree is likely to be poor. If you have already left BUILD and are back at the CART phase of analysis, grow an exploratory tree with: ERROR EXPLORE setting the complexity to a value that limits the tree to a size you wish to examine. Find the c
