Count Active ID with master calendar

[pthai]

Hi everyone,

I need help to count active id on master calendar.

My expression is 

=Count({<EffectiveDate={'='>=' & $({Tipo={"hire"}>}EffectiveDate) '<=' & $({<Tipo={"terminate"}>}EffectiveDate)'}>}distinct ID)

My expected result is:

MonthYear	Active ID
Jan-2015	1
Feb-2015	1
Mar-2015	1
Apr-2015	1
May-2015	1
Jun-2015	1
Jul-2015	2
Aug-2015	2
Sep-2015	2
Oct-2015	2
Nov-2015	2
Dec-2015	2
Jan-2016	2
Feb-2016	3
Mar-2016	3
Apr-2016	3
May-2016	3
Jun-2016	3
Jul-2016	3
Aug-2016	3
Sep-2016	3
Oct-2016	2
Nov-2016	2
Dec-2016	2