Set Analysis - Previous Week using a Date time Field

[#1]

I'm struggling to write an expression in a line graph to show the previous week's information. I'd also like a Year to Date average to show as a separate line.

Count({$<(=Week(DateCreated))={$((=Week(DateCreated))-1)>},if(type = 'SHIPMENT',type))

Can someone explain where I am going wrong and the reason for it not working?

[ecolomer]

Try without =

Count({$<(Week(DateCreated))={$((=Week(DateCreated))-1)>},if(type = 'SHIPMENT',type))

[#3]

Doesn't make a difference unfortunately - it appears to just be plotting the current week selection and not the week-1

[#4]

Try

Count({$<(Week(DateCreated))={$((=Week(DateCreated)-1))>},if(type = 'SHIPMENT',type))

[JonnyPoole]

Check out this explanatory post on grabbing prior periods.

the above() function may help you grab previous week data in a chart.

Calculating rolling n-period totals, averages or other aggregations

[erivera10]

I also saw what you saw, either.