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# Uncertainty

The term "uncertainty" refers to the possibility of multiple outcomes.

## Aleatory Uncertainty

Aleatory uncertainty is inherent randomness in data that can't be explained away.

Also Known As:
* statistical uncertainty
* stochastic uncertainty
* random error

## Epistemic Uncertainty

Epistemic uncertainty is that which arises from a lack of knowledge.

Also Known As:
* systematic uncertainty
* model uncertainty