Feature #2322

[PATCH] Add standard deviation function to Math Module

Added by Daniel Cohen about 6 years ago. Updated over 3 years ago.

Assignee:Kenta Murata


This patch adds a Standard Deviation function to the Math Module. It takes an array and finds the standard deviation of all its elements, as long as they are numbers.

add_stdev.diff Magnifier - Patch to add standard deviation feature (982 Bytes) Daniel Cohen, 11/02/2009 05:29 AM

Related issues

Related to Ruby trunk - Feature #2321: [PATCH] Array Module sum and mean features Rejected 11/01/2009


#1 Updated by Kazuhiro NISHIYAMA over 5 years ago

  • Target version set to 2.0.0



#2 Updated by Hiroshi Nakamura over 3 years ago

  • Description updated (diff)
  • Assignee set to Kenta Murata

#3 Updated by Shyouhei Urabe over 3 years ago

  • Status changed from Open to Assigned

#4 Updated by Kenta Murata over 3 years ago

  • Status changed from Assigned to Rejected

Why do we need to specially treat the 2nd central moment, that is standard deviation, than the other nth moment, such as skewness (3rd) and kurtosis (4th)?

You can use NArray for that reason. See http://narray.rubyforge.org/index.html.en

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