Source
incanter/stats.clj:1460
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(defn variance
"
Returns the sample variance of the data, x. Equivalent to R's var function.
Examples:
(variance (sample-normal 100))
References:
http://incanter.org/docs/parallelcolt/api/cern/jet/stat/tdouble/DoubleDescriptive.html
http://en.wikipedia.org/wiki/Sample_variance#Population_variance_and_sample_variance
"
([x] (DoubleDescriptive/sampleVariance (length x) (sum x) (sum-of-squares x))))
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