Created
November 6, 2011 21:44
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Compute wilson score
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| # Compute the comment score | |
| def compute_comment_score(c) | |
| upcount = (c['up'] ? c['up'].length : 0) | |
| downcount = (c['down'] ? c['down'].length : 0) | |
| n = upcount + downcount | |
| return 0 if n==0 | |
| #1.6 = 95%,1.0 = 85% | |
| z = 1.6 | |
| phat = Float(ups) / n | |
| Math.sqrt(phat+z*z/(2*n)-z*((phat*(1-phat)+z*z/(4*n))/n))/(1+z*z/n) | |
| end |
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