I am having an issue with the the summarize function whereby when I use the sum function to total the values in a column, I am getting a 0 value, even though the numbers do not total 0. I can't see why this is happening, however the only explanation I can think of is that the data has some negative values in it. Would this affect the sum function? I have used it before and this didn't seem to impact it.
Any help would be greatly appreciated.