class_docstr: Mann-Whitney-Wilcoxon U test accumulator.
  
  Stores rank orders (1 to N), for comparison with a uniform order.
docstr: z-score of the null hypothesis (uniform distribution) probability.
docstr_tok: ["z-score","of","the","null","hypothesis","(","uniform","distribution",")","probability","."]
code: def zscore(self):
      """z-score of the null hypothesis (uniform distribution) probability."""
      N = self.N
      if N == 0:
          return 0.0
      m_U = N * 0.5
      sigma_U_corr = (N / 12.0) ** 0.5
      return (self.U - m_U) / sigma_U_corr
  
file_path: ultranest/ultranest/ordertest.py
imports: from __future__ import print_function, division
label_desc: Use image node_id 4 for calling the UniformOrderAccumulator obj's underlying member method code with example usage: obj.zscore() and returns: unknown, int