jmckible / standard_deviation
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Standard Deviation plugin for ActiveRecord (mysql only)
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README.rdoc
standard_deviation
Adds standard deviation methods to ActiveRecord. sqlite does not include standard deviation methods by default, so this is designed for mysql only.
Installation
./script/plugin install git://github.com/jmckible/standard_deviation.git
Usage
This plugin adds two new aggregations methods to ActiveRecord: std and variance. Say you’ve got a measurements table with an integer column called ‘integer.’
Measurement.std(:integer) # => 0.8165 Measurement.variance(:integer) # => 0.6667
Author
- standard_deviation was created by Jordan McKible jordan.mckible.com
- Available on GitHub at github.com/jmckible/standard_deviation
