Zovo Decision Tree

Use this when the user wants a decision tree checked without a drawing, for example "do my probabilities add up to 1" or "is anything missing in this tree". Takes the same outline or node list and objective as make_decision_tree. Returns, for each chance node, the sum of its branch probabilities as a fraction and whether it is 1; end nodes without a payoff; probabilities on decision options; payoffs on nodes that have branches; single-option decisions; duplicate branch names; and the depth and node counts against the limits. When nothing is wrong it also gives the root expected value. Refuses a tree it is unable to read (unknown parent, a loop, two roots, over the limits), naming the line or id. Does not draw the tree or make files. Do not use it to estimate probabilities.

Use this when the user wants a decision tree drawn or solved: options of a decision, chance events with probabilities, and payoffs, for example "which option has the higher expected value" or "draw a decision tree for launching this product". Takes the tree as an indented outline or a JSON node list, the objective (max or min), a unit, decimals, a page size and a title. Rolls the tree back with fractions: the expected value of each node, the chosen option at each decision (ties listed), branch costs applied by a stated rule, and the risk profile of the chosen strategy. Refuses a tree whose chance probabilities do not add up to 1, naming the node and the sum, and end nodes without a payoff. Returns a summary, an interactive drawing, and PDF, SVG and CSV downloads. Up to 300 nodes. Does not estimate probabilities or give advice. Download links of large trees expire after about 1 hour.