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Add an example for chi-square homogeneity test #39

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Add an example for chi-square homogeneity test #39

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23 changes: 23 additions & 0 deletions examples/chisquare_test.rb
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Original file line number Diff line number Diff line change
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#!/usr/bin/ruby
$:.unshift(File.dirname(__FILE__)+'/../lib')
require 'statsample'

Statsample::Analysis.store(Statsample::Test::ChiSquare) do
# Collect the two vectors with the categorical data (raw number of occurences) into one matrix. Here
#--------------------------------------------
#| category | observation 1 | observation 2 |
#|------------------------------------------|
#| A | 100 | 20 |
#| B | 50 | 70 |
#| C | 30 | 100 |
#|------------------------------------------|
#
m=Matrix[[100, 50, 30],[20, 70, 100]]
x_2=Statsample::Test.chi_square(m)
# after the test is done, look at the p-value.
puts x_2.probability
end

if __FILE__==$0
Statsample::Analysis.run_batch
end