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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)
@engine.pdf(v,k).should 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)
@engine.cdf(v,k).should 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)
@engine.p_value(pr,k).should 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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