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require File.expand_path(File.dirname(__FILE__)+"/spec_helper.rb")
include ExampleWithGSL
describe Distribution::T do
shared_examples_for "T engine(with rng)" do
it "should return correct rng" do
pending()
end
end
shared_examples_for "T engine(cdf with fractional df)" do
it "should return correct cdf with fractional df" do
@engine.cdf(1,2.5).should be_within(1e-6).of(0.7979695)
@engine.cdf(2,3.5).should be_within(1e-6).of(0.9369307)
@engine.cdf(3,4.5).should be_within(1e-6).of(0.9828096)
end
end
shared_examples_for "T engine" do
it_only_with_gsl "should return correct pdf" do
if @engine.respond_to? :pdf
[-2,0.1,0.5,1,2].each{|t|
[2,5,10].each{|n|
@engine.pdf(t,n).should be_within(1e-6).of(GSL::Ran.tdist_pdf(t,n))
@engine.pdf(t,n.to_f).should be_within(1e-6).of(@engine.pdf(t,n))
}
}
else
pending("No #{@engine}.pdf")
end
end
it_only_with_gsl "should return correct cdf" do
if @engine.respond_to? :cdf
# Testing with R values
@engine.cdf(1,2).should be_within(1e-7).of(0.7886751)
@engine.cdf(1,2.0).should be_within(1e-7).of(0.7886751)
@engine.cdf(1,3.0).should be_within(1e-7).of(0.8044989)
[-2,0.1,0.5,1,2].each{|t|
[2,5,10].each{|n|
@engine.cdf(t,n).should be_within(1e-4).of(GSL::Cdf.tdist_P(t,n))
@engine.cdf(t,n).should be_within(1e-4).of(@engine.cdf(t,n.to_f))
}
}
else
pending("No #{@engine}.cdf")
end
end
it_only_with_gsl "should return correct p_value" do
if @engine.respond_to? :p_value
[-2,0.1,0.5,1,2].each{|t|
[2,5,10].each{|n|
area=Distribution::T.cdf(t,n)
@engine.p_value(area,n).should be_within(1e-4).of(GSL::Cdf.tdist_Pinv(area,n))
}
}
else
pending("No #{@engine}.p_value")
end
end
end
describe "singleton" do
before do
@engine=Distribution::T
end
it_should_behave_like "T engine"
end
describe Distribution::T::Ruby_ do
before do
@engine=Distribution::T::Ruby_
end
it_should_behave_like "T engine"
it_should_behave_like "T engine(cdf with fractional df)"
end
if Distribution.has_gsl?
describe Distribution::T::GSL_ do
before do
@engine=Distribution::T::GSL_
end
it_should_behave_like "T engine"
it_should_behave_like "T engine(cdf with fractional df)"
end
end
=begin
if Distribution.has_statistics2?
describe Distribution::T::Statistics2_ do
before do
@engine=Distribution::T::Statistics2_
end
it_should_behave_like "T engine"
end
end
=end
if Distribution.has_java?
describe Distribution::T::Java_ do
before do
@engine=Distribution::T::Java_
end
it_should_behave_like "T engine"
end
end
end
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