Class: Skab::Models::Binomial
- Inherits:
-
Object
- Object
- Skab::Models::Binomial
- Defined in:
- lib/skab/models/binomial.rb
Class Method Summary collapse
Instance Method Summary collapse
- #differential ⇒ Object
- #distribution ⇒ Object
-
#initialize(args) ⇒ Binomial
constructor
A new instance of Binomial.
Constructor Details
#initialize(args) ⇒ Binomial
Returns a new instance of Binomial.
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# File 'lib/skab/models/binomial.rb', line 5 def initialize(args) @a_trials = args.shift.to_i @a_success = args.shift.to_i @b_trials = args.shift.to_i @b_success = args.shift.to_i end |
Class Method Details
.help ⇒ Object
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# File 'lib/skab/models/binomial.rb', line 50 def self.help <<-HELP skab [output] binomial [trials_a] [successes_a] [trials_b] [successes_b] \tWhere: all parameters are integers \tPlots the binomial distribution for A and B, given their respective \tnumber of successes and trials HELP end |
Instance Method Details
#differential ⇒ Object
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# File 'lib/skab/models/binomial.rb', line 35 def differential return @differential if @differential @differential = Hash.new(0) i = 0.0 while i <= 1000 j = 0.0 while j <= 1000 @differential[(j - i) / 1000] += distribution[j][2] * distribution[i][1] j += 1 end i += 1 end @differential end |
#distribution ⇒ Object
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# File 'lib/skab/models/binomial.rb', line 12 def distribution return @distribution if @distribution @distribution = [] sums = [0, 0, 0] i = 0.0 while i <= 1000 @distribution[i] = [] @distribution[i][0] = i / 1000 @distribution[i][1] = binomial(@a_trials, @a_success, i / 1000) @distribution[i][2] = binomial(@b_trials, @b_success, i / 1000) sums[1] += binomial(@a_trials, @a_success, i / 1000) sums[2] += binomial(@b_trials, @b_success, i / 1000) i += 1 end i = 0.0 while i <= 1000 @distribution[i][1] /= sums[1] @distribution[i][2] /= sums[2] i += 1 end @distribution end |