A Summation user defined field (UDF) is a Permanent Information field available for use in a data grid, form, report, or as a filter in scheduling. It is a simple yet powerful UDF that provides useful information when analyzing pipeline data.The function of a Summation UDF is to aggregate data for a target field using one of the following operators: Average, Count, Latest, Maximum, Minimum, and Sum. As an option, you can also include one or more filters that run either before or after the data aggregation.Example: Set up a Summation UDF using Structure P/S as the target field and Average as the operator. Include a Calculated UDF as a filter in the Summation UDF that is set up to find the variance between the actual and average Structure P/S reading for test points. The expression for the Calculated UDF is ABS([My Summation Name] – [Structure P/S]). Add the Summation and Calculated UDFs in the Test Point Inspection data grid to view the results of the data aggregation. For more information about working with a Calculated UDF, refer to Adding a Calculated User Defined Field.Information in this section explains how to work with a Summation user defined field. Topics include those in the following list: