I have a table of data with value 3 columns: two columns have values, the third column has the difference bteween these values, can be a negative or positive number. Without sorting the data, I want to calculate the running % of total of the difference column ignoring the sign (ie treating the difference as absolute). The purpose is this: the differences are 'variances' between actual and budget. I want to pick those items with highest absolute differences that account for at least 80% of all differences. I can do this by adding a column to convert the differences to absolute, add another column with Rank and a third column that has the running total based on the preceding two columns. But I want to do all the culations in a single column, without having to add 2 new columns (for absolute difference and rank).