Alan Gates commented on PIG-1150:
We've had some requests to add a fixed point type for issues where precision
problems aren't acceptable. Another option for you would be to add the
variance now in double and when a fixed point type is added add a fix point
version of variance.
> VAR() Variance UDF
> Key: PIG-1150
> URL: https://issues.apache.org/jira/browse/PIG-1150
> Project: Pig
> Issue Type: New Feature
> Affects Versions: 0.5.0
> Environment: UDF, written in Pig 0.5 contrib/
> Reporter: Russell Jurney
> Fix For: 0.7.0
> Attachments: var.patch
> I've implemented a UDF in Pig 0.5 that implements Algebraic and calculates
> variance in a distributed manner, based on the AVG() builtin. It works by
> calculating the count, sum and sum of squares, as described here:
> Is this a worthwhile contribution? Taking the square root of this value
> using the contrib SQRT() function gives Standard Deviation, which is missing
> from Pig.
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