[/url]SSRS 2005 matrixes do not support any other aggregation than sum in subtotal/total row. You can either complete the calculations in the data source, or you can split the data portion of the matrix into multiple parts by adding more than one text box within a single field. Mr. Martin Cremer has some idea for this situation in his posting: Reporting Services: Adding extra columns / rows to a matrix
By Martin Cremer, 2008/07/24