examples/levene.rb in statsample-1.5.0 vs examples/levene.rb in statsample-2.0.0

@@ -1,15 +1,29 @@
 #!/usr/bin/ruby
 $:.unshift(File.dirname(__FILE__)+'/../lib/')
 
+# == Description
+# 
+# This example demonstrates how a levene test can be performed by
+# using Daru::Vector and the Statsample::Test::Levene class.
+# 
+# Levene's test is an inferential statistic used to assess the
+# equality of variances for a variable calculated for two or more groups.
+# 
+# == References
+# 
+# http://en.wikipedia.org/wiki/Levene%27s_test
 require 'statsample'
 
 Statsample::Analysis.store(Statsample::Test::Levene) do
 
-  a=[1,2,3,4,5,6,7,8,100,10].to_numeric
-  b=[30,40,50,60,70,80,90,100,110,120].to_numeric
+  a = Daru::Vector.new([1,2,3,4,5,6,7,8,100,10])
+  b = Daru::Vector.new([30,40,50,60,70,80,90,100,110,120])
+
+  # The 'levene' function is used as a shorthand 
+  # for creating a Statsample::Test::Levene object.
   summary(levene([a,b]))
 end
 
 if __FILE__==$0
-   Statsample::Analysis.run_batch
+  Statsample::Analysis.run_batch
 end