Module: Ablab::AblabHelper

Defined in:
app/helpers/ablab/ablab_helper.rb

Instance Method Summary collapse

Instance Method Details

#confidence(z_score, na = 'n/a') ⇒ Object 



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# File 'app/helpers/ablab/ablab_helper.rb', line 22

def confidence(z_score, na = 'n/a')
  return na if z_score.nil? || z_score.nan?
  if z_score >= 2.58
    '99%'
  elsif z_score >= 1.96
    '95%'
  elsif z_score >= 1.65
    '90%'
  else
    'insufficient'
  end
end

#format_decimal(decimal, na = 'n/a') ⇒ Object 



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# File 'app/helpers/ablab/ablab_helper.rb', line 13

def format_decimal(decimal, na = 'n/a')
  return na if decimal.nil? || decimal.nan?
  '%.3f' % decimal
end

#format_number(number, na = 'n/a') ⇒ Object 



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# File 'app/helpers/ablab/ablab_helper.rb', line 8

def format_number(number, na = 'n/a')
  return na if number.nil? || number.try(:nan?)
  number_with_delimiter(number, separator: '.', delimiter: ',')
end

#format_ratio(numerator, denominator, na = 'n/a') ⇒ Object 



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# File 'app/helpers/ablab/ablab_helper.rb', line 3

def format_ratio(numerator, denominator, na = 'n/a')
  return na if denominator == 0
  '%.3f' % (numerator.to_f / denominator)
end

#significant?(z_score) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'app/helpers/ablab/ablab_helper.rb', line 18

def significant?(z_score)
  z_score && z_score >= 1.65
end

#winner?(experiment, group_name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'app/helpers/ablab/ablab_helper.rb', line 35

def winner?(experiment, group_name)
  winner_name, winner_results = experiment.results.max_by do |(_, r)|
    if r[:sessions] > 0
      r[:conversions].to_f / r[:sessions]
    else
      -1
    end
  end
  significant?(winner_results[:z_score]) && winner_name == group_name
end