Method: Statsample::Test::UMannWhitney#probability_z

Defined in:
lib/statsample/test/umannwhitney.rb

#probability_z ⇒ Object

Assuming H_0, the proportion of cdf with values of U lower than the sample, using normal approximation. Use with more than 30 cases per group.



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# File 'lib/statsample/test/umannwhitney.rb', line 202

def probability_z
  (1-Distribution::Normal.cdf(z.abs()))*2
end