The ProcessVariation global element is the process variation (6-sigma) over all included observations corresponding to the "PROVAR" StatsValuesEnumType enumeration.
<xs:element name="ProcessVariation" type="StatsMeasuredDecimalType" substitutionGroup="NumericCharacteristicStatsValue"><xs:annotation><xs:documentation>The ProcessVariation global element is the process variation (6-sigma) over all included observations corresponding to the "PROVAR" StatsValuesEnumType enumeration.</xs:documentation></xs:annotation></xs:element>