Reimplement the stddev visitor
------------------------------
Key: GEOT-3214
URL: http://jira.codehaus.org/browse/GEOT-3214
Project: GeoTools
Issue Type: Improvement
Components: core main
Reporter: Andrea Aime
Assignee: Andrea Aime
The current visitor is nothing short of a tragedy, does not use converters and
needs a pre-computed average.
Use this numerically stable single pass one instead:
http://www.johndcook.com/standard_deviation.html
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