Aggr and sum if formula

[#1]

I need to create a formula that will count the number of sales agents who have a presentation count within the presentation count bucket that I have created in the expression part of a straight table.   I have a criteria that the presentation must meet before I can count the agent in my sum.

I am creating a straight table with presentation count buckets at the top.

I am trying to get my formula to sum the count of agents who have 1 presentation a week where that sale premium is >= $600.

My problem is that my expression is counting all sales regardless of the premium amount.  So if the agent had 2 sales; Sale A had a premium of $200 and SaleB had a premium $1200 then the agent would be counted in the PresentationCount=1 bucket.

sum

(aggr(if(count([presentationcount])=1 and

sum({$<part1={'*life*'}>}part1.premiun)+

Sum({$<part2={'*single*'}>}part.2premium)+

Sum({$<part3={'*california*'}>}part3.premium) >= 600, 1, 0), [AgentName],Week))

Week	1	2	3	4	5+
4/25/2013	5	3	2	1	1
4/18/2013	6	2	1	2	1

Any help is greaty appreciated.  Thanks!