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POItem rankings, order by confidence using Reddit Ranking Algorithms
 

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  1. POItem rankings, order by confidence using Reddit Ranking Algorithms
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    <p>I am interested to use this <a href="https://gist.github.com/91media/1478806">ranking class</a>, based off of an article by <a href="http://www.evanmiller.org/how-not-to-sort-by-average-rating.html">Evan Miller</a> to rank a table I have that has upvotes and downvotes. I have a system very similar to Stack Overflow's up/down voting system for an events site I am working on, and by using this ranking class I feel as though results will be more accurate. My question is how do I order by the function 'hotness'?</p> <pre><code>private function _hotness($upvotes = 0, $downvotes = 0, $posted = 0) { $s = $this-&gt;_score($upvotes, $downvotes); $order = log(max(abs($s), 1), 10); if($s &gt; 0) { $sign = 1; } elseif($s &lt; 0) { $sign = -1; } else { $sign = 0; } $seconds = $posted - 1134028003; return round($order + (($sign * $seconds)/45000), 7); } </code></pre> <p>I suppose each time a user votes I could have a column in my table that has the hotness data recalculated for the new vote, and order by that column on the main page. But I am interested to do this more on-the-fly incorporating the function above, and I am not sure if that is possible.</p> <p>From Evan Miller, he uses:</p> <pre><code>SELECT widget_id, ((positive + 1.9208) / (positive + negative) - 1.96 * SQRT((positive * negative) / (positive + negative) + 0.9604) / (positive + negative)) / (1 + 3.8416 / (positive + negative)) AS ci_lower_bound FROM widgets WHERE positive + negative &gt; 0 ORDER BY ci_lower_bound DESC; </code></pre> <p>But I rather not do this calculation in the sql as I feel this is messy and difficult to change down the line if I utilize this code on multiple pages .etc.</p>
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    1. COTake a look at this, it might help you. http://blog.glocal.com/2012/12/tuning-your-own-reddit-style-ranking.html
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