Class: Vanity::Experiment::Alternative

Inherits:

Object

• Object
• Vanity::Experiment::Alternative

show all

Defined in:

lib/vanity/experiment/ab_test.rb

Overview

Instance Attribute Summary (collapse)

• - (Object) difference

  Difference from least performing alternative.

• - (Object) experiment readonly

  Experiment this alternative belongs to.

• - (Object) id readonly

  Alternative id, only unique for this experiment.

• - (Object) name readonly

  Alternative name (option A, option B, etc).

• - (Object) probability

  Probability derived from z-score.

• - (Object) value readonly

  Alternative value.

• - (Object) z_score

  Z-score for this alternative, related to 2nd-best performing alternative.

Instance Method Summary (collapse)

• - (Object) <=>(other)
• - (Object) ==(other)
• - (Object) conversion_rate

  Conversion rate calculated as converted/participants.

• - (Object) conversions

  Number of conversions for this alternative (same participant may be counted more than once).

• - (Object) converted

  Number of participants who converted on this alternative (a participant is counted only once).

• - (Alternative) initialize(experiment, id, value) constructor

  , participants, converted, conversions).

• - (Object) inspect
• - (Object) load_counts
• - (Object) measure

  The measure we use to order (sort) alternatives and decide which one is better (by calculating z-score).

• - (Object) participants

  Number of participants who viewed this alternative.

• - (Object) to_s

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# File 'lib/vanity/experiment/ab_test.rb', line 9

def initialize(experiment, id, value) #, participants, converted, conversions)
  @experiment = experiment
  @id = id
  @name = "option #{(@id + 65).chr}"
  @value = value
end

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# File 'lib/vanity/experiment/ab_test.rb', line 53

def difference
  @difference
end

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# File 'lib/vanity/experiment/ab_test.rb', line 26

def experiment
  @experiment
end

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# File 'lib/vanity/experiment/ab_test.rb', line 17

def id
  @id
end

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# File 'lib/vanity/experiment/ab_test.rb', line 20

def name
  @name
end

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# File 'lib/vanity/experiment/ab_test.rb', line 50

def probability
  @probability
end

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# File 'lib/vanity/experiment/ab_test.rb', line 23

def value
  @value
end

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# File 'lib/vanity/experiment/ab_test.rb', line 47

def z_score
  @z_score
end

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# File 'lib/vanity/experiment/ab_test.rb', line 66

def <=>(other)
  measure <=> other.measure 
end

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# File 'lib/vanity/experiment/ab_test.rb', line 70

def ==(other)
  other && id == other.id && experiment == other.experiment
end

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# File 'lib/vanity/experiment/ab_test.rb', line 56

def conversion_rate
  @conversion_rate ||= (participants > 0 ? converted.to_f/participants.to_f  : 0.0)
end

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# File 'lib/vanity/experiment/ab_test.rb', line 41

def conversions
  load_counts unless @conversions
  @conversions
end

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# File 'lib/vanity/experiment/ab_test.rb', line 35

def converted
  load_counts unless @converted
  @converted
end

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# File 'lib/vanity/experiment/ab_test.rb', line 78

def inspect
  "#{name}: #{value} #{converted}/#{participants}"
end

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# File 'lib/vanity/experiment/ab_test.rb', line 82

def load_counts
  if @experiment.playground.collecting?
    @participants, @converted, @conversions = @experiment.playground.connection.ab_counts(@experiment.id, id).values_at(:participants, :converted, :conversions)
  else
    @participants = @converted = @conversions = 0
  end
end

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# File 'lib/vanity/experiment/ab_test.rb', line 62

def measure
  conversion_rate
end

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# File 'lib/vanity/experiment/ab_test.rb', line 29

def participants
  load_counts unless @participants
  @participants
end

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# File 'lib/vanity/experiment/ab_test.rb', line 74

def to_s
  name
end