All Implemented Interfaces:
NamedWriteable, Writeable, org.elasticsearch.common.xcontent.ToXContent, org.elasticsearch.common.xcontent.ToXContentFragment

public class ChiSquare extends NXYSignificanceHeuristic
  • Field Details

  • Constructor Details

    • ChiSquare

      public ChiSquare(boolean includeNegatives, boolean backgroundIsSuperset)
    • ChiSquare

      public ChiSquare(StreamInput in) throws IOException
      Read from a stream.
      Throws:
      IOException
  • Method Details

    • equals

      public boolean equals(Object other)
      Overrides:
      equals in class NXYSignificanceHeuristic
    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class NXYSignificanceHeuristic
    • getScore

      public double getScore(long subsetFreq, long subsetSize, long supersetFreq, long supersetSize)
      Calculates Chi^2 see "Information Retrieval", Manning et al., Eq. 13.19
      Specified by:
      getScore in class SignificanceHeuristic
      Parameters:
      subsetFreq - The frequency of the term in the selected sample
      subsetSize - The size of the selected sample (typically number of docs)
      supersetFreq - The frequency of the term in the superset from which the sample was taken
      supersetSize - The size of the superset from which the sample was taken (typically number of docs)
      Returns:
      a "significance" score
    • getWriteableName

      public String getWriteableName()
      Description copied from interface: NamedWriteable
      Returns the name of the writeable object
    • toXContent

      public org.elasticsearch.common.xcontent.XContentBuilder toXContent(org.elasticsearch.common.xcontent.XContentBuilder builder, org.elasticsearch.common.xcontent.ToXContent.Params params) throws IOException
      Throws:
      IOException