Rozenshtein Method

If you not familiar with it, the <a href="http://www.stephenforte.net/owdasblog/permalink.aspx?guid=2b0532fc-4318-4ac0-a405-15d6d813eeb8">Rozenshtein Method</a> uses SQL to create a crosstab. The concept is a stroke of genius but I'm having trouble getting it to work on one of production databases.

I successfully used the Northwind example explained at Stephen Forte's site (see the link above)...but no luck on my real world problems.

I can get the date statements to resolve to 0 correctly, but when I try to aggregate the data - the statements are turning into 1 multiplying the aggregate data for each cell...which fills in the same data across the entire row.

For example (the columns represent the time period),
GROUP T1 T2 T3 T4
group1 9 9 9 9
group2 3 3 3 3
group3 5 5 5 5

My sql code is:
SELECT dbo.tblHassBatch.ProdLine,
COUNT((dbo.tblHassUUT.UnitID)*(1-ABS(SIGN(datediff(dd,dbo.tblHassBatch.StartTime,ge tdate())-0)))) AS Today,
COUNT((dbo.tblHassUUT.UnitID)*(1-ABS(SIGN(datediff(ww,dbo.tblHassBatch.StartTime,ge tdate())-0)))) AS [This Week],
COUNT((dbo.tblHassUUT.UnitID)*(1-ABS(SIGN(datediff(mm,dbo.tblHassBatch.StartTime,ge tdate())-0)))) AS [This Month],
COUNT((dbo.tblHassUUT.UnitID)*(1-ABS(SIGN(datediff(mm,dbo.tblHassBatch.StartTime,ge tdate())-1)))) AS [Last Month]
FROM dbo.tblHassBatch INNER JOIN
dbo.tblHassUUT ON dbo.tblHassBatch.BatchID = dbo.tblHassUUT.BatchID
GROUP BY dbo.tblHassBatch.ProdLine

Am I overlooking something here? I'm pulling my hair out b/c if this works it's really going to provide a great solution for a project I'm working on...but I can't seem to figure it out.

Any help is appreciated.

Thanks,

Alex8675