Created
April 8, 2010 06:46
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require 'rubygems' | |
require 'ruby-debug' | |
def sim_pearson(data, compare1, compare2) | |
puts | |
puts | |
puts "sim_pearson" | |
puts "===========" | |
# Vemos si comparten items, sino saldremos | |
shared_items = [] | |
data[compare1].each_key do |item| | |
shared_items << item if data[compare2].has_key?(item) | |
end | |
n = shared_items.size | |
return 0 unless n>0 | |
sum1 = sum2 = sum1Sq = sum2Sq = pSum = 0.0 | |
# puts "shared_items: #{shared_items.inspect}" | |
shared_items.each do |item| | |
data1_item = data[compare1][item] || 0.0 | |
data2_item = data[compare2][item] || 0.0 | |
puts "item: #{item} (d1item: #{data1_item} - d2item: #{data2_item})" | |
sum1 += data1_item | |
sum2 += data2_item | |
sum1Sq += data1_item ** 2 | |
sum2Sq += data2_item ** 2 | |
pSum += data2_item * data1_item | |
# puts " sum1: #{sum1} - sum2: #{sum2} - sum1Sq: #{sum1Sq} - sum2Sq: #{sum2Sq} - pSum: #{pSum}" | |
end | |
num = pSum - ((sum1*sum2)/n) | |
den = Math.sqrt((sum1Sq - (sum1**2 )/n) * (sum2Sq - (sum2**2)/n)) | |
puts ">> num: #{num} - den: #{den} - #{(den == 0 ? 0 : num/den)}" | |
return (den == 0 ? 0 : num/den) | |
end | |
def sim_blatson(data, compare1, compare2) | |
puts | |
puts | |
puts "sim_blatson" | |
puts "===========" | |
# Vemos si comparten items, sino saldremos | |
shared_items = [] | |
data[compare1].each_key do |item| | |
next if !data[compare2].has_key?(item) || (data[compare1][item] == 3 && data[compare2][item] == 3) | |
shared_items << item | |
end | |
n = shared_items.size | |
return 0 unless n>0 | |
sum1 = sum2 = sum1Sq = sum2Sq = pSum = 0.0 | |
# puts "shared_items: #{shared_items.inspect}" | |
shared_items.each do |item| | |
data1_item = data[compare1][item] || 0.0 | |
data2_item = data[compare2][item] || 0.0 | |
puts "item: #{item} (d1item: #{data1_item} - d2item: #{data2_item})" | |
sum1 += data1_item | |
sum2 += data2_item | |
sum1Sq += data1_item ** 2 | |
sum2Sq += data2_item ** 2 | |
pSum += data2_item * data1_item | |
puts " sum1: #{sum1} - sum2: #{sum2} - sum1Sq: #{sum1Sq} - sum2Sq: #{sum2Sq} - pSum: #{pSum}" | |
end | |
num = pSum - ((sum1*sum2)/n) | |
den = Math.sqrt((sum1Sq - (sum1**2 )/n) * (sum2Sq - (sum2**2)/n)) | |
puts ">> num: #{num} - den: #{den} - #{(den == 0 ? 0 : num/den)}" | |
return (den == 0 ? 0 : num/den) | |
end | |
data = { | |
'u1' => { 'a' => 5, 'b' => 3, 'c' => 1 }, | |
'u5' => { 'a' => nil, 'b' => 3, 'c' => 1 }, | |
'u2' => { 'a' => 1, 'b' => 3, 'c' => 1 }, | |
'u3' => { 'a' => 2, 'b' => 3, 'c' => 1 }, | |
'u4' => { 'a' => 3, 'b' => 3, 'c' => 1 }, | |
'u6' => { 'a' => 4, 'b' => 3, 'c' => 1 } | |
} | |
sim_pearson(data, 'u1', 'u5') | |
sim_pearson(data, 'u1', 'u2') | |
sim_pearson(data, 'u1', 'u3') | |
sim_pearson(data, 'u1', 'u4') | |
sim_pearson(data, 'u1', 'u6') | |
sim_blatson(data, 'u1', 'u5') | |
sim_blatson(data, 'u1', 'u2') | |
sim_blatson(data, 'u1', 'u3') | |
sim_blatson(data, 'u1', 'u4') | |
sim_blatson(data, 'u1', 'u6') |
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