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require File.expand_path(File.dirname(__FILE__)+"/spec_helper.rb")
describe Distribution::Shorthand do
include Distribution::Shorthand
it "should have basic methods for all distributions" do
[:Normal,:ChiSquare, :F, :Hypergeometric, :Binomial, :T].each do |d|
klass=Distribution.const_get(d)
shortname=klass::SHORTHAND
methods=[:pdf, :cdf, :p_value].map {|m| "#{shortname}_#{m}".to_sym}
methods.each do |m|
Distribution::Shorthand.instance_methods.map {|v| v.to_sym}.should include(m)
end
end
end
it "should have exact methods discrete distributions" do
[:Hypergeometric, :Binomial].each do |d|
klass=Distribution.const_get(d)
shortname=klass::SHORTHAND
methods=[:epdf, :ecdf].map {|m| "#{shortname}_#{m}".to_sym}
methods.each do |m|
Distribution::Shorthand.instance_methods.map {|v| v.to_sym}.should include(m)
end
end
end
it "returns same values as long form" do
x=rand()
norm_cdf(x).should eql(Distribution::Normal.cdf(x))
norm_pdf(x).should eql(Distribution::Normal.pdf(x))
norm_p_value(x).should eql(Distribution::Normal.p_value(x))
end
end
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