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Contents
module Bmg
class Summarizer
#
# Percentile summarizer.
#
# Example:
#
# # direct ruby usage
# Bmg::Summarizer.percentile(:qty, 50).summarize(...)
#
class Percentile < Summarizer
DEFAULT_OPTIONS = {
:variant => :continuous
}
def initialize(*args, &bl)
@nth = args.find{|a| a.is_a?(Integer) } || 50
functor = args.find{|a| a.is_a?(Symbol) } || bl
options = args.select{|a| a.is_a?(Hash) }.inject(DEFAULT_OPTIONS){|memo,opts|
memo.merge(opts)
}.dup
super(functor, options)
end
# Returns [] as least value.
def least()
[]
end
# Collects the value
def _happens(memo, val)
memo << val
end
# Finalizes the computation.
def finalize(memo)
return nil if memo.empty?
index = memo.size.to_f * (@nth.to_f / 100.0)
floor, ceil = index.floor, index.ceil
ceil +=1 if floor == ceil
below = [floor - 1, 0].max
above = [[ceil - 1, memo.size - 1].min, 0].max
sorted = memo.sort
if options[:variant] == :continuous
(sorted[above] + sorted[below]) / 2.0
else
sorted[below]
end
end
end # class Avg
def self.percentile(*args, &bl)
Percentile.new(*args, &bl)
end
def self.percentile_cont(*args, &bl)
Percentile.new(*(args + [{:variant => :continuous}]), &bl)
end
def self.percentile_disc(*args, &bl)
Percentile.new(*(args + [{:variant => :discrete}]), &bl)
end
def self.median(*args, &bl)
Percentile.new(*(args + [50]), &bl)
end
def self.median_cont(*args, &bl)
Percentile.new(*(args + [50, {:variant => :continuous}]), &bl)
end
def self.median_disc(*args, &bl)
Percentile.new(*(args + [50, {:variant => :discrete}]), &bl)
end
end # class Summarizer
end # module Bmg
Version data entries
30 entries across 30 versions & 1 rubygems