Ben Bangert committed 14d2960

Link to python cookbook instead of ref.

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     return mean([low, high])
 def standard_deviation(r):
-    """Standard deviation, from the Python Cookbook
+    """Standard deviation, `from the Python Cookbook
+    <>`_
     Standard deviation shows the variability within a sequence of numbers.
     A small standard deviation shows the numbers are close to the same.  A