The StandardDeviation global element is the sample standard deviation of all all included observations corresponding to the "STDDEV" StatsValuesEnumType enumeration.
<xs:element name="StandardDeviation" type="StatsMeasuredDecimalType" substitutionGroup="NumericCharacteristicStatsValue"><xs:annotation><xs:documentation>The StandardDeviation global element is the sample standard deviation of all all included observations corresponding to the "STDDEV" StatsValuesEnumType enumeration.</xs:documentation></xs:annotation></xs:element>