Class: FSelector::BaseDiscrete

Inherits:

Base

• Object
• Base
• FSelector::BaseDiscrete

Includes:

Discretizer

Defined in:

lib/fselector/algo_base/base_discrete.rb

Overview

base alogrithm for discrete feature

many algos are based on the following 2 x 2 contingency table

      c   c'
    ---------
 f  | A | B | A+B
    |---|---| 
 f' | C | D | C+D
    ---------
     A+C B+D  N = A+B+C+D

 P(f)     = (A+B)/N
 P(f')    = (C+D)/N
 P(c)     = (A+C)/N
 P(c')    = (B+D)/N
 P(f,c)   = A/N
 P(f,c')  = B/N
 P(f',c)  = C/N
 P(f',c') = D/N
 P(f|c)   = A/(A+C)
 P(f|c')  = B/(B+D)
 P(f'|c)  = C/(A+C)
 P(f'|c') = D/(B+D)

Direct Known Subclasses

Accuracy, AccuracyBalanced, BiNormalSeparation, ChiSquaredTest, CorrelationCoefficient, DocumentFrequency, F1Measure, FastCorrelationBasedFilter, FishersExactTest, GMean, GSSCoefficient, GiniIndex, INTERACT, InformationGain, JMeasure, KLDivergence, MatthewsCorrelationCoefficient, McNemarsTest, MutualInformation, OddsRatio, OddsRatioNumerator, Power, Precision, ProbabilityRatio, Sensitivity, Specificity, SymmetricalUncertainty

Instance Method Summary

• #initialize(data = nil) ⇒ BaseDiscrete constructor

  initialize from an existing data structure.

Methods included from Discretizer

#discretize_by_Chi2!, #discretize_by_ChiMerge!, #discretize_by_MID!, #discretize_by_TID!, #discretize_by_equal_frequency!, #discretize_by_equal_width!

Methods included from Entropy

#get_conditional_entropy, #get_information_gain, #get_joint_entropy, #get_marginal_entropy, #get_symmetrical_uncertainty

Methods included from Consistency

#get_IR, #get_IR_by_count, #get_IR_by_feature, #get_instance_count

Methods inherited from Base

#algo_type, #each_class, #each_feature, #each_sample, #get_class_labels, #get_classes, #get_data, #get_data_copy, #get_feature_ranks, #get_feature_scores, #get_feature_type, #get_feature_values, #get_features, #get_opt, #get_sample_size, #select_feature!, #select_feature_by_rank!, #select_feature_by_score!, #set_classes, #set_data, #set_feature_type, #set_features, #set_opt

Methods included from ReplaceMissingValues

#replace_by_fixed_value!, #replace_by_knn_value!, #replace_by_mean_value!, #replace_by_median_value!, #replace_by_most_seen_value!

Methods included from FileIO

#data_from_csv, #data_from_libsvm, #data_from_random, #data_from_url, #data_from_weka, #data_to_csv, #data_to_libsvm, #data_to_weka

Constructor Details

#initialize(data = nil) ⇒ BaseDiscrete

initialize from an existing data structure

# File 'lib/fselector/algo_base/base_discrete.rb', line 36

def initialize(data=nil)
  super(data)
end