[dylan-foundry/statistics] aa5db7: Add variance and standard deviation.

  Branch: refs/heads/master
  Home:   https://github.com/dylan-foundry/statistics
  Commit: aa5db780d77823cb503a44fc45b22eeac2b7a66b
      https://github.com/dylan-foundry/statistics/commit/aa5db780d77823cb503a44fc45b22eeac2b7a66b
  Author: Bruce Mitchener <[email protected]>
  Date:   2015-11-16 (Mon, 16 Nov 2015)

  Changed paths:
    M statistics-base/library.dylan
    M statistics-base/statistics-base.lid
    A statistics-base/variance.dylan
    M tests/statistics-base-test-suite.dylan

  Log Message:
  -----------
  Add variance and standard deviation.

* statistics-base/variance.dylan
  (variance-internal): Calculate the sum of the squared variations
   from the mean.
  (variance/sample, variance/population): Calculate variance.
  (standard-deviation/sample,
   standard-deviation/population): Calculate standard deviation.

* statistics-base/library.dylan
  (module statistics-base): Export new bindings.

* statistics-base/statistics-base.lid: Build variance.dylan

* tests/statistics-base-test-suite.dylan
  (test variance+standard-deviation-test): Rough test of new functionality.
  (suite variance-test-suite): Run the new test.
  (suite statistics-base-test-suite): Run variance-test-suite.

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