Issue with set analysis expression

[#1]

Hi,

Can someone please tell me what is wrong with the below statement

=sum({$<CrimeYear = {$(vCrimeYear) - 1}, CrimeMonth = {"<=$(vCrimeMonth)"}>} Casenum )

Actually I have used the below expression for Current YTD

=sum({$<CrimeYear = {$(vCrimeYear)}, CrimeMonth = {"<=$(vCrimeMonth)"}>} Casenum )

I wanted to have a Previous YTD so that I wondered if I could simply substract the year by one..$(vCrimeYear) - 1 but its not working. I am sure I am making a syntax mistake so I will appreciate if someone could correct my expression

Regards

Arif

[Nicole-Smith]

=sum({$<CrimeYear = {$(=$(vCrimeYear) - 1)}, CrimeMonth = {"<=$(vCrimeMonth)"}>} Casenum )