Module: Termplot::Widgets::Statistics

Included in:
Dataset
Defined in:
lib/termplot/widgets/statistics.rb

Instance Method Summary collapse

Instance Method Details

#count ⇒ Object 



4
5
6
 
# File 'lib/termplot/widgets/statistics.rb', line 4

def count
  data.count
end

#mean ⇒ Object 



8
9
10
11
 
# File 'lib/termplot/widgets/statistics.rb', line 8

def mean
  return 0 if data.empty?
  data.sum(0.0) / count
end

#standard_deviation ⇒ Object 



13
14
15
16
17
18
 
# File 'lib/termplot/widgets/statistics.rb', line 13

def standard_deviation
  return 0 if data.empty?
  data_mean = mean
  variance = data.map { |x| (data_mean - x) ** 2 }.sum / count
  Math.sqrt(variance)
end