From 6bde559981fa11ffd265af708956f9d4ee6c9a89 Mon Sep 17 00:00:00 2001 From: Christoph Helma Date: Thu, 8 Oct 2015 10:32:31 +0200 Subject: crossvalidation plots, original classification confidence --- lib/overwrite.rb | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'lib/overwrite.rb') diff --git a/lib/overwrite.rb b/lib/overwrite.rb index be90c56..c92ad2b 100644 --- a/lib/overwrite.rb +++ b/lib/overwrite.rb @@ -96,6 +96,16 @@ class Array self.inject{ |sum, el| sum + el }.to_f / self.size end + def sample_variance + m = self.mean + sum = self.inject(0){|accum, i| accum +(i-m)**2 } + sum/(self.length - 1).to_f + end + + def standard_deviation + Math.sqrt(self.sample_variance) + end + end module URI -- cgit v1.2.3