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module Benchmark
module IPS
module Stats
class SD
include StatsMetric
attr_reader :error, :samples
def initialize(samples)
@samples = samples
@mean = Timing.mean(samples)
@error = Timing.stddev(samples, @mean).round
end
# Average stat value
# @return [Float] central_tendency
def central_tendency
@mean
end
# Determines how much slower this stat is than the baseline stat
# if this average is lower than the faster baseline, higher average is better (e.g. ips) (calculate accordingly)
# @param baseline [SD|Bootstrap] faster baseline
# @returns [Array<Float, nil>] the slowdown and the error (not calculated for standard deviation)
def slowdown(baseline)
if baseline.central_tendency > central_tendency
[baseline.central_tendency.to_f / central_tendency, nil]
else
[central_tendency.to_f / baseline.central_tendency, nil]
end
end
def speedup(baseline)
baseline.slowdown(self)
end
def footer
nil
end
end
end
end
end
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