HomeTroubleshootingPrecisionTree"Decision Tree ... exceeds the size limit of the professional edition."

# 12.5. "Decision Tree ... exceeds the size limit of the professional edition."

Applies to: PrecisionTree 5.x–7.x, Professional Edition

When I open my tree, I get this message in Excel's status bar:

PrecisionTree: Decision tree 'name' exceeds the size limit of the professional edition of PrecisionTree. [ALT+F10]-Goto [ALT+F12]-Error Dialog

Pressing Alt+F10 takes me to the root of the tree, and Alt+F12 displays the same message in a dialog box.

In the Professional Edition of PrecisionTree, the size of any one tree is limited to 1000 nodes. If you're not sure how many nodes you have, an easy way to check (if you haven't inserted rows through Excel's Insert command) is to take the last Excel row number in the tree, subtract the first row number in the tree, add 1, and divide by 2. For example, if your tree uses Excel rows 15 through 2744, you have 2744–15+1 = 2730 rows in your tree, and 2730/2 = 1365 nodes.

You can simplify repetitive branches of decision trees by replacing them with reference nodes that point to a single subtree. This will probably make your tree more easy to understand and maintain, but it won't evade the 1000-node limit. The number of nodes in a subtree counts against the limit for each point where the subtree is attached to the main tree or referenced in a reference node.

If you need to work with trees larger than 1000 nodes, please contact your Palisade sales manager to upgrade your DecisionTools Suite or PrecisionTree license to the Industrial Edition, which has no limit on tree sizes.

But my message is

Influence Diagram 'name' exceeds the size limit of the professional edition of PrecisionTree.

My influence diagram has well under 1000 nodes.

The 1000-node limit applies to the number of nodes that would exist in a decision tree created from that influence diagram. A decision tree can be much, much larger than the influence diagram it was created from, because the number of nodes in the decision tree increases roughly as a power of the size of the influence diagram. (Looking at it another way, an influence diagram is very compressed, and the corresponding decision tree is much larger because every possibility is spelled out in a unique path.) Thus, even an influence diagram of a dozen nodes could exceed the decision-tree limit.

Contact your Palisade sales manager to upgrade to the Industrial Edition, which has no limits on the size of influence diagrams or decision trees.

Last edited: 2016-09-19