73 lines
2.6 KiB
Ruby
73 lines
2.6 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, :upload_limit, :max_upload_limit, :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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def deletion_confidence_interval
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Reports::UserPromotions.deletion_confidence_interval_for(user)
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end
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def negative_score_confidence_interval
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Reports::UserPromotions.negative_score_confidence_interval_for(user)
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end
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def median_score
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ActiveRecord::Base.select_value_sql("select percentile_cont(0.50) within group (order by score) from posts where created_at >= ? and uploader_id = ?", ::Reports::UserPromotions.min_time, user.id).to_i
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end
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def quartile_score
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ActiveRecord::Base.select_value_sql("select percentile_cont(0.25) within group (order by score) from posts where created_at >= ? and uploader_id = ?", ::Reports::UserPromotions.min_time, user.id).to_i
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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)
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end
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def self.deletion_confidence_interval_for(user, days = nil)
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date = (days || 60).days.ago
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deletions = Post.where("created_at >= ?", date).where(:uploader_id => user.id, :is_deleted => true).count
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total = Post.where("created_at >= ?", date).where(:uploader_id => user.id).count
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ci_lower_bound(deletions, total)
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end
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def self.negative_score_confidence_interval_for(user, days = nil)
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date = (days || 60).days.ago
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hits = Post.where("created_at >= ? and score < 0", date).where(:uploader_id => user.id).count
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total = Post.where("created_at >= ?", date).where(:uploader_id => user.id).count
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ci_lower_bound(hits, total)
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end
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def self.ci_lower_bound(pos, n, confidence = 0.95)
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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.bit_prefs & ? = 0 and users.post_upload_count >= 250", ::User.flag_value_for("can_upload_free")).order("created_at desc").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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