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