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require File.expand_path(File.dirname(__FILE__) + '/spec_helper.rb')
include ExampleWithGSL
describe Distribution::ChiSquare do
shared_examples_for 'Chi-square engine(with pdf)' do
it_only_with_gsl 'should return correct pdf' do
if @engine.respond_to? :pdf
1.upto(10) do |k|
v = 1 + rand(5)
chi = GSL::Ran.chisq_pdf(v, k)
expect(@engine.pdf(v, k)).to be_within(10e-10).of(chi)
end
else
skip("No #{@engine}.pdf")
end
end
end
shared_examples_for 'Chi-square engine' do
it_only_with_gsl 'should return correct cdf' do
if @engine.respond_to? :cdf
1.upto(10) do |k|
v = 1 + rand(5)
chi = GSL::Cdf.chisq_P(v, k)
expect(@engine.cdf(v, k)).to be_within(10e-10).of(chi)
end
else
skip("No #{@engine}.cdf")
end
end
it 'should return correct p_value' do
if @engine.respond_to? :p_value
1.upto(10) do |k|
v = 1 + rand(5)
pr = @engine.cdf(v, k)
expect(@engine.p_value(pr, k)).to be_within(10e-4).of(v)
end
else
skip("No #{@engine}.p_value")
end
end
end
describe 'singleton' do
before do
@engine = Distribution::ChiSquare
end
it_should_behave_like 'Chi-square engine'
it_should_behave_like 'Chi-square engine(with pdf)'
end
describe Distribution::ChiSquare::Ruby_ do
before do
@engine = Distribution::ChiSquare::Ruby_
end
it_should_behave_like 'Chi-square engine'
it_should_behave_like 'Chi-square engine(with pdf)'
end
if Distribution.has_gsl?
describe Distribution::ChiSquare::GSL_ do
before do
@engine = Distribution::ChiSquare::GSL_
end
it_should_behave_like 'Chi-square engine'
it_should_behave_like 'Chi-square engine(with pdf)'
end
end
if Distribution.has_statistics2?
describe Distribution::ChiSquare::Statistics2_ do
before do
@engine = Distribution::ChiSquare::Statistics2_
end
it_should_behave_like 'Chi-square engine'
end
end
if Distribution.has_java?
describe Distribution::ChiSquare::Java_ do
before do
@engine = Distribution::ChiSquare::Java_
end
it_should_behave_like 'Chi-square engine'
it_should_behave_like 'Chi-square engine(with pdf)'
end
end
end
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