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 How to use Standard Deviation in expression		  New Topic  Reply to Topic
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arvi
Starting Member

Philippines
2 Posts
Posted - 01/17/2013 :  03:50:08  Show Profile  Reply with Quote
Hi,

I'm creating a quarterly report for email performance and I want to include standard deviation on the report.

Is it possible to use the StDev in expression given the figures per month?

-------------Sent------StDev
Email 1------4500-------???
January-----1000
February----1500
March-------2000

Email 2------4550-------???
January-----1300
February----1550
March-------1700

Email 3------5500-------???
January-----1700
February----1300
March-------2500


TIA

visakh16
Very Important crosS Applying yaK Herder

India
47069 Posts
Posted - 01/17/2013 :  04:06:55  Show Profile  Reply with Quote
you can use StDev() function in reporting services for that. make sure you pass scope correctly (month level or whatever grouping level you want)

http://msdn.microsoft.com/en-us/library/ms155807(v=sql.90).aspx

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/
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James K
Flowing Fount of Yak Knowledge

1497 Posts
Posted - 01/17/2013 :  04:10:21  Show Profile  Reply with Quote
STDEV and STDDEVP are available in SQL Server. STDDEV is for sample population (N-1 in the denominator) and STDDEVP is for entire population (or if you have a large enough sample and want to consider that as the universe (N in the denominator)).

I didn't quite get the structure of your data - so not sure what std dev you are trying to calculate - whether it is the emailN or whether it is months (aggregated) or something else.
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arvi
Starting Member

Philippines
2 Posts
Posted - 01/17/2013 :  04:24:31  Show Profile  Reply with Quote
thanks for the link Visha

but how can I include the group by Month in this expression?

=StDev(Fields!Sent.Value, "DataSet1")

When I compute in Excel , StDev for Email is 500.
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visakh16
Very Important crosS Applying yaK Herder

India
47069 Posts
Posted - 01/17/2013 :  04:29:49  Show Profile  Reply with Quote
you've added a grouping based on month in your report right? then you just need to pass month group name inside scope argument like below

=StDev(Fields!Sent.Value, "Month Group Name")

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SQL Server MVP
http://visakhm.blogspot.com/
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