Sha256: f9452f693d5d113acbeb4830f0e5e3e34bbe339ab029f7764187b7a80c2b9cc9
Contents?: true
Size: 622 Bytes
Versions: 11
Compression:
Stored size: 622 Bytes
Contents
module Metricize
module Stats
def sum
return self.inject(0){|accum, i| accum + i }
end
def mean
return self.sum / self.length.to_f
end
def sample_variance
m = self.mean
sum = self.inject(0){|accum, i| accum + (i - m) ** 2 }
return sum / (self.length - 1).to_f
end
def standard_deviation
return Math.sqrt(self.sample_variance)
end
def calculate_percentile(percentile)
return self.first if self.size == 1
values_sorted = self.sort
k = (percentile*(values_sorted.length-1)+1).floor - 1
values_sorted[k]
end
end
end
Version data entries
11 entries across 11 versions & 1 rubygems