I am attempting to write a report that shows the results of a quiz.  The quiz is given multiple times.  I want to show only those who have taken the quiz multiple times.  I have worked this piece out through the suppress feature with a formula.  I have them grouped by each person.  Next, I would like to show the difference between the first taking of the quiz to the second, second to third difference, etc...   I used the formula {@totalscore}-previous({@totalscore}) and placed it in the details section next to each score.  It is great for lines two and three, etc..., but it is showing on the first line, the difference between the previous person and this person's first score.  Is there a way to suppress this first detail or to reset this totalscore on each change of person.  Or is there a way to do a running difference.

Thanks, but that won't work.  I need the detail to print for the first quiz score:  data looks like this

0007854    Barney Rubble 

That worked perfectly.  Thank you.