Trees are a data viz tool that has outlived empires and endured huge upheavals in the arts and sciences.

A directed graph is said to be a tree if it has a root and there is a unique directed path from the root to every node in the tree. An equivalent characterization of a tree is that the root node has ...

Advertisement A decision tree is basically a decision making tool or diagram that asks a yes or no question. If the answer is “no” then the tree leads to another branch.