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module Gitlab
module CycleAnalytics
class UsageData
PROJECTS_LIMIT = 10
attr_reader :projects, :options
def initialize(projects, options)
@projects = projects
@options = options
end
def to_json
total = 0
values = {}
medians_per_stage.each do |stage_name, medians|
medians = medians.compact
stage_values = {
average: calc_average(medians),
sd: standard_deviation(medians),
missing: projects.length - medians.length
}
total += stage_values.values.compact.sum
values[stage_name] = stage_values
end
values[:total] = total
{ avg_cycle_analytics: values }
end
private
def medians_per_stage
@medians_per_stage ||= ::CycleAnalytics.all_medians_per_stage(projects, options)
end
def calc_average(values)
return if values.empty?
(values.sum / values.length).to_i
end
def sample_variance(values)
return 0 if values.length <= 1
avg = calc_average(values)
sum = values.inject(0) do |acc, val|
acc + (val - avg)**2
end
sum / (values.length - 1)
end
def standard_deviation(values)
Math.sqrt(sample_variance(values)).to_i
end
end
end
end
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