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Refactors hot_score calculations

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kikito
2015-09-04 13:59:30 +02:00
parent 920ba48947
commit 83ebbb14b1
1 changed files with 11 additions and 9 deletions
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20
app/models/debate.rb
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@@ -106,20 +106,22 @@ class Debate < ActiveRecord::Base
def calculate_hot_score
z = 1.96 # Normal distribution with a confidence of 0.95
time_unit = 12.hours
time_unit = 1.0 * 12.hours
start = Time.new(2015, 6, 15)
comments_weight = 1.0/3 # 3 comments == 1 positive vote
n = cached_votes_total + comments_count / 3
pos = cached_votes_up + comments_count / 3
weighted_score = 0
phat = 1.0 * pos / n
n = cached_votes_total + comments_weight * comments_count
if n > 0 then
pos = cached_votes_up + comments_weight * comments_count
phat = 1.0 * pos / n
weighted_score = (phat + z*z/(2*n) - z * Math.sqrt((phat*(1-phat)+z*z/(4*n))/n))/(1+z*z/n)
end
weigted_score = n == 0 ? 0 :
(phat + z*z/(2*n) - z * Math.sqrt((phat*(1-phat)+z*z/(4*n))/n))/(1+z*z/n)
age_in_units = 1.0 * ((created_at || Time.now) - start) / time_unit
age_in_units = ((created_at || Time.now) - start) / time_unit
self.hot_score = (age_in_units**3 + weigted_score * 1000).round
self.hot_score = (age_in_units**3 + weighted_score * 1000).round
end
protected