I am attempting to create a crosstab with the measure broken into size groups on the horizontal axis on top and time periods on the vertical axis. I would like to get period over period variance for each size group. I created a data item using nested IF-statements called "Segment Group" to break the measure into size groups. I then created a data item called "Measure Variance" using "running-difference( ( measure) for (segment group) )" to use in the crosstab to attempt to get the period over period variance. When I do this, the output gives me a total variance for that period just in the first column and leaves the rest of the columns blank, rather than giving me a variance for each "segment group" as I wish. Any ideas on this problem I'm having? Thanks in advance!