43 lines
1.2 KiB
Ruby
43 lines
1.2 KiB
Ruby
require 'statistics2'
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module Reports
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class UserPromotions
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class User
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attr_reader :user
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delegate :name, :post_upload_count, :level_string, :level, :created_at, :to => :user
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def initialize(user)
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@user = user
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end
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def confidence_interval_for(n)
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Reports::UserPromotions.confidence_interval_for(user, n)
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end
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end
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def self.confidence_interval_for(user, n)
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up_votes = Post.where("created_at >= ?", min_time).where(:is_deleted => false, :uploader_id => user.id).where("score >= ?", n).count
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total_votes = Post.where("created_at >= ?", min_time).where(:uploader_id => user.id).count
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ci_lower_bound(up_votes, total_votes, 0.95)
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end
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def self.ci_lower_bound(pos, n, confidence)
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if n == 0
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return 0
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end
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z = Statistics2.pnormaldist(1-(1-confidence)/2)
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phat = 1.0*pos/n
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100 * (phat + z*z/(2*n) - z * Math.sqrt((phat*(1-phat)+z*z/(4*n))/n))/(1+z*z/n)
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end
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def self.min_time
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30.days.ago
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end
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def users
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::User.where("users.level < ? and users.post_upload_count >= 150", ::User::Levels::CONTRIBUTOR).order("created_at desc").limit(50).map {|x| Reports::UserPromotions::User.new(x)}
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end
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end
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end
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