- Was ist: Off-Diagonal-Element
- Was ist: Orthogonales Polynom
- Was ist: Oszillatorische Konvergenz
- Was ist: Überidentifikationstest
- Was ist: Orthogonale Projektion
- Was ist: Orthogonale Transformation
- Was ist: Ausreißererkennung
- Was ist: Betriebspunkt
- Was ist: Ausgabevariable
- Was ist: Ordnungserhaltende Transformation