Odds Ratio
On-Line Analytic Processing (OLAP)
One-of-N Encoding (in Neural Networks)
One-Off (in Neural Networks)
One-Sample t-test
One-way Tables
Operating Characteristic Curves
Ordinal Multinomial Distribution
Ordinal Scale
Outer Arrays
Outliers
Outliers (in Box Plots)
Overfitting
Overlearning (in Neural Networks)
Overparameterized Model