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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