Module: DescriptiveStatistics::Dispersion

Included in:
AllMethods
Defined in:
lib/descriptive-statistics/dispersion.rb

Instance Method Summary collapse

Instance Method Details

#percentile_from_value(value) ⇒ Object 



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# File 'lib/descriptive-statistics/dispersion.rb', line 9

def percentile_from_value(value)
  return if length < 1
  (sort.index(value) / length.to_f * 100).ceil
end

#range ⇒ Object 



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# File 'lib/descriptive-statistics/dispersion.rb', line 3

def range
  return if length < 1
  sorted = sort
  sorted.last - sorted.first
end

#value_from_percentile(percentile) ⇒ Object 



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# File 'lib/descriptive-statistics/dispersion.rb', line 14

def value_from_percentile(percentile)
  return if length < 1
  value_index = (percentile.to_f / 100 * length).ceil
  sort[value_index]
end