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mindscratch/percentile_sample.rb

Created September 19, 2011 01:22
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80th percentile
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percentile_sample.rb
values = [1, 9, 3, 12, 29, 30, 33, 17, 5, 0, 23, 7, 19, 18, 32, 56, 34]
sorted = values.sort
percentile = 0.80
num_vals = (percentile * sorted.count).ceil
puts "Values within the #{(percentile * 100).to_i}th percentile: #{sorted[0, num_vals]}"
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