class_docstr: Binary confusion matrix class
docstr: Prevalence = P / TotalPopulation
docstr_tok: ["Prevalence","=","P","\/","TotalPopulation"]
code: def prevalence(self):
      """
      Prevalence = P / TotalPopulation
      """
      return np.float64(self.P) / self.population
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import math
  import numpy
  import pandas
  import collections
  from pandas_ml.confusion_matrix.abstract import ConfusionMatrixAbstract
label_desc: Use image node_id 38 for calling the BinaryConfusionMatrix obj's underlying member method code with example usage: obj.prevalence() and returns: unknown