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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
expect(@engine.cdf(1, 2.5)).to be_within(1e-6).of(0.7979695)
expect(@engine.cdf(2, 3.5)).to be_within(1e-6).of(0.9369307)
expect(@engine.cdf(3, 4.5)).to 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|
expect(@engine.pdf(t, n)).to be_within(1e-6).of(GSL::Ran.tdist_pdf(t, n))
expect(@engine.pdf(t, n.to_f)).to 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
expect(@engine.cdf(1, 2)).to be_within(1e-7).of(0.7886751)
expect(@engine.cdf(1, 2.0)).to be_within(1e-7).of(0.7886751)
expect(@engine.cdf(1, 3.0)).to be_within(1e-7).of(0.8044989)
[-2, 0.1, 0.5, 1, 2].each{|t|
[2, 5, 10].each{|n|
expect(@engine.cdf(t, n)).to be_within(1e-4).of(GSL::Cdf.tdist_P(t, n))
expect(@engine.cdf(t, n)).to 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)
expect(@engine.p_value(area, n)).to 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
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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