=== modified file 'dhis-2/dhis-api/src/main/java/org/hisp/dhis/dataelement/DataElement.java'
--- dhis-2/dhis-api/src/main/java/org/hisp/dhis/dataelement/DataElement.java	2014-04-06 11:19:24 +0000
+++ dhis-2/dhis-api/src/main/java/org/hisp/dhis/dataelement/DataElement.java	2014-04-21 16:43:24 +0000
@@ -104,6 +104,8 @@
     public static final String AGGREGATION_OPERATOR_SUM = "sum";
     public static final String AGGREGATION_OPERATOR_AVERAGE = "average";
     public static final String AGGREGATION_OPERATOR_COUNT = "count";
+    public static final String AGGREGATION_OPERATOR_STDDEV = "stddev";
+    public static final String AGGREGATION_OPERATOR_VARIANCE = "variance";
 
     /**
      * The name to appear in forms.

=== modified file 'dhis-2/dhis-services/dhis-service-i18n/src/main/resources/i18n_global.properties'
--- dhis-2/dhis-services/dhis-service-i18n/src/main/resources/i18n_global.properties	2014-04-01 10:21:31 +0000
+++ dhis-2/dhis-services/dhis-service-i18n/src/main/resources/i18n_global.properties	2014-04-21 16:43:24 +0000
@@ -430,6 +430,8 @@
 sum=Sum
 count=Count
 average=Average
+stddev=Standard deviation
+variance=Variance
 text=Text
 string=String
 int=Number

=== modified file 'dhis-2/dhis-web/dhis-web-maintenance/dhis-web-maintenance-datadictionary/src/main/webapp/dhis-web-maintenance-datadictionary/dataElementForm.vm'
--- dhis-2/dhis-web/dhis-web-maintenance/dhis-web-maintenance-datadictionary/src/main/webapp/dhis-web-maintenance-datadictionary/dataElementForm.vm	2014-01-28 12:20:08 +0000
+++ dhis-2/dhis-web/dhis-web-maintenance/dhis-web-maintenance-datadictionary/src/main/webapp/dhis-web-maintenance-datadictionary/dataElementForm.vm	2014-04-21 16:43:24 +0000
@@ -143,6 +143,8 @@
 				<option value="sum" #if( $!dataElement.aggregationOperator == 'sum' ) selected="selected" #end>$i18n.getString( "sum" )</option>
 				<option value="average" #if( $!dataElement.aggregationOperator == 'average' ) selected="selected" #end>$i18n.getString( "average" )</option>
                 <option value="count" #if( $!dataElement.aggregationOperator == 'count' ) selected="selected" #end>$i18n.getString( "count" )</option>
+                <option value="stddev" #if( $!dataElement.aggregationOperator == 'stddev' ) selected="selected" #end>$i18n.getString( "stddev" )</option>
+                <option value="variance" #if( $!dataElement.aggregationOperator == 'variance' ) selected="selected" #end>$i18n.getString( "variance" )</option>
 			</select>
 		</td>
 	</tr>