Sha256: d11387bef952d5382e02b575d704f5a9faed1fb1911b9147c625429927d663c0
Contents?: true
Size: 359 Bytes
Versions: 15
Compression:
Stored size: 359 Bytes
Contents
class Array
def mean
@the_sample_mean ||= inject(:+)/length.to_f
end
def sample_variance
sum = inject(0){|accum, i| accum + (i-mean)**2 }
sum/(length - 1).to_f
end
def stdev
Math.sqrt sample_variance
end
end
class Fixnum
def mm
self * 2.83464566929134
end
end
class Float
def mm
self * 2.83464566929134
end
end
Version data entries
15 entries across 15 versions & 1 rubygems