Decision tree
Take an umbrella today?
Take it
Rain (30%): you stay dry
No rain (70%): you carry it all day
Leave it
Rain (30%): you get soaked
No rain (70%): hands free
Make a decision tree
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What a decision tree is
“A decision tree is a decision support recursive partitioning structure that uses a tree-like model of decisions and their possible consequences, including chance event outcomes, resource costs, and utility.”
Types of decision tree
When to use a decision tree
Choosing
Lay out each choice and what could happen after it, then pick the choice with the best endings.
Maths
Write the chance of each outcome on its branch, like the 30% chance of rain.
Planning
Think a plan through before you commit to it, including what happens if things go wrong.
How to make a decision tree
- 1The questionTake an umbrella today?
- 2Your optionsTake an umbrella today?Take itLeave it
- 3What could happenTake an umbrella today?Take itRain (30%): you stay dryNo rain (70%): you carry it all dayLeave itRain (30%): you get soakedNo rain (70%): hands free
Helpful resources
Questions
- Where are decision trees used?
Decision trees are commonly used in operations research, specifically in decision analysis, to help identify a strategy most likely to reach a goal, but are also a popular tool in machine learning.
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