sql server - SQL STDEV on a calculate column -

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so have 2 columns want division on want stdev on resulting column trying following sql doesnt work havent been able figure out how save internal select variable , stdev on var. barking wrong tree? ideas? 

select  stdev(   select         convert(decimal(20,5),convert(decimal(20,5),(s.received))         /convert(decimal(20,5),(s.sent)))*100 ddr          sometable s          s.somethingname = 'thisthingsname'          , s.date '2015-04-16%' ) sometable 

select      stdev(         convert(decimal(20,5),convert(decimal(20,5),(s.received))         / convert(decimal(20,5),(s.sent)))*100       ) deviation      sometable s     s.somethingname = 'thisthingsname'      , s.date '2015-04-16%'

please note if version of sql server 2008 or higher, can 

and cast(s.date date) = '2015-04-16'

and in sql server 2012 can 

and cast(s.date date) = datefromparts(2015,04,16)

rather (non-exact!) string comparison on date field.


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