Sample Data
-------------
Account ID	Month		#patients
----------	-------		----------
1		Jan2017		5
2		Jan2017		3
3		Feb2017		7
4		Feb2017		6
5		Feb2017		2
6		Mar2017		4
7		Apr2017		1
8		Apr2017		10
9		Apr2017		9
10		Apr2017		3



Typical calculation in SAS VA 7.4
-----------------------------------
Monthly Median (Easy using median function)
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Month		Median Patients
---------	---------------		
Jan2017		4		( 5+3 ) /2
Feb2017		6		middle of ( 2,6,7 )
Mar2017		4		
Apr2017		6		middle of ( 1,3,9,10 )  = (3+9)/2 = 6



Cumulative Monthly Median (Desired in SAS VA 7.4) Any idea how to calculate this assuming this is in a List Table with only two fields (Month and Median Patients)?
------------------------------------------------------------------------------------------------------------------------------------------------------------
Month		Median Patients
--------	-----------------
Jan2017		4		( 5+3 ) /2
Feb2017		5		middle of ( 2,3,5,6,7 ) 	= 5
Mar2017		5		middle of (2,3,4,5,6,7 ) 	= (4+5) /2 = 4.5(approx. 5 when rounded)
Apr2017		5		middle of(1,2,3,3,4,5,6,7,9,10) = (4+5) /2 = 4.5(approx. 5 when rounded)