Qlik Set Analysis and aggregating across date ranges - qlikview

Question

I am trying to use Qlik set analysis and range sum to compute the total number of records that were active at a some point in the month
For example, if these are the records:
id state created_date modified_date
1 expired 01/12/2014 10/12/2014
2 expired 01/12/2014 10/03/2015
3 active 01/12/2014 01/12/2014
4 expired 10/01/2015 12/01/2015
5 expired 10/01/2015 11/03/2015
6 active 10/02/2015 10/02/2015
7 expired 10/03/2015 11/03/2015
The expected o/p is
Dec-14 3
Jan-15 4
Feb-15 4
Mar-15 5
E.g: For Jan-2015 the result should be 4 -
1 active record from Dec 2014 + 2 created in Jan + 1 from Dec which actually expired in March 2015
modified_date is updated when a record is expired
So I tried this:
rangesum(above(Count({$<[state] = {'active'} >} id), 0,12))
+ Count({1<[state] ={'expired'}, modified_date.Calendar.Month ={">=$(created_date.Calendar.Month)"}>} id)
the second count statement is wrong. How can I aggregate the records which are currently not active but were active at some point during the month.Is it possible to achieve this without using a Master calendar ?
Thanks in advance!

Answer 1

A better approach to this would be to amend your data model to include an active date like below.
ActiveMonthsRaw:
Load ID
,date(monthstart(created_date),''MMM-YY) as ActiveMonthFormat
resident SourceTable
where state ='active';
ActiveMonthsRaw:
Load ID
,date(monthstart(modified_date),''MMM-YY) as ActiveMonthFormat
resident SourceTable
where state ='expired';
ActiveMonths:
Load distinct ID
,ActiveMonthFormat as ActiveMonth;
drop table ActiveMonthsRaw;
It would then be a case of doing a distinct count of ID by the Active Month. No Set analysis in sight!