Aggregate Statistics 
This action is used to return statistical information for a set of values. An XPath expression, or a path to a specific set of values in an XML document, must be defined to identify the values for the statistics calculation.
The properties for this action are listed in the following table:
Property | Data Type | Access | Use |
Min | String | In and out | Identifies the minimum value in the data set that is specified by the ValueSource parameter. |
Max | String | In and out | Identifies the maximum value in the data set that is specified by the ValueSource parameter. |
Average | String | In and out | Identifies the average value of the data set that is specified by the ValueSource parameter. |
StdDev | String | In and out | Identifies the standard deviation value of the data set that is specified by the ValueSource parameter. |
Count | String | In and out | Specifies the number of values in the data set that are used to determine the calculated value. |
Total | String | In and out | Specifies the sum of the values contained in the data set which were specified by the ValueSource parameter. |
ValueSource | String | In and out | Specifies the XPath expression to the value for which the statistical calculations are performed. |
Success | Boolean | Out | Indicates whether the action succeeded or failed. If it failed, errors are displayed in the server trace log. |