I am trying to perform a calculation between two fields that are on linked data sources. My orginial file has data for participants of different groups ("Participants"), but these participants are only a portion of each group's total participants. I want to calculate the % of total participants that are included in my original data file. Therefore, I have pulled in the "All Participants" field for each group from another source (although this field was a list of names, so it is now a count. I want to divide my "Participants (COUNT)" fom the original file by "All Participants (COUNT)" so that I get a % of participation for each group. I am getting an error message that says I can't perform the calculation between separate datasources and haven't been able to find a workaround. Does anyone know how to get around this?