lib/distribution/binomial/ruby.rb in distribution-0.7.3 vs lib/distribution/binomial/ruby.rb in distribution-0.8.0

@@ -4,10 +4,13 @@
       class << self
         def pdf(k, n, pr)
           fail 'k>n' if k > n
           Math.binomial_coefficient(n, k) * (pr**k) * (1 - pr)**(n - k)
         end
+
+        alias_method :exact_pdf, :pdf
+
         # TODO: Use exact_regularized_beta for
         # small values and regularized_beta for bigger ones.
         def cdf(k, n, pr)
           # (0..x.floor).inject(0) {|ac,i| ac+pdf(i,n,pr)}
           Math.regularized_beta(1 - pr, n - k, k + 1)
@@ -17,18 +20,18 @@
           out = (0..k).inject(0) { |ac, i| ac + pdf(i, n, pr) }
           out = 1 if out > 1.0
           out
         end
 
-        def p_value(prob, n, pr)
+        def quantile(prob, n, pr)
           ac = 0
           (0..n).each do |i|
             ac += pdf(i, n, pr)
             return i if prob <= ac
           end
         end
 
-        alias_method :exact_pdf, :pdf
+        alias_method :p_value, :quantile
       end
     end
   end
 end