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Bug 366787 - Standard deviation returns 'NaN' when equal values are given
Summary: Standard deviation returns 'NaN' when equal values are given
Status: NEW
Alias: None
Product: z_Archived
Classification: Eclipse Foundation
Component: BIRT (show other bugs)
Version: 2.6.2   Edit
Hardware: All All
: P3 normal (vote)
Target Milestone: ---   Edit
Assignee: Birt-Data-inbox@eclipse.org CLA
QA Contact: Hao Zhou CLA
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2011-12-15 03:59 EST by Tim Winselmann CLA
Modified: 2011-12-29 00:54 EST (History)
2 users (show)

See Also:

Attachments
A report with a standard deviation (7.39 KB, application/octet-stream)
2011-12-15 03:59 EST, Tim Winselmann CLA 		no flags Details
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Description Tim Winselmann CLA 2011-12-15 03:59:16 EST 
Created attachment 208424 [details]
A report with a standard deviation

I was trying to calculate the standard deviation of three equal values (like 25.63, 25.63, 25.63) within the Aggregation Builder via Function STDDEV. The returned value is 'NaN' and not the correct value "0".

I have attached a report that shows the reported behavior.