The NumberSubgroups global element is the number of subgroups used in the statistical evaluation corresponding to the "NUMSUB" StatsValuesEnumType enumeration.
<xs:element name="NumberSubgroups" type="StatsNonNegativeIntegerType" substitutionGroup="CommonStatsValue"><xs:annotation><xs:documentation>The NumberSubgroups global element is the number of subgroups used in the statistical evaluation corresponding to the "NUMSUB" StatsValuesEnumType enumeration.</xs:documentation></xs:annotation></xs:element>