📄 monthly_variance_and_entropy.php
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<?php/** * Script the reports monthly variance and entropy. */require_once "config.php";require_once PHPMATH . "/IT/ArrayMath.php";require_once PHPMATH . "/IT/TableEntropy.php";$e = new TableEntropy;$e->setTable("Webstats");$e->setColumn("ip");?><html> <head> <title>Monthly Variance and Entropy</title> </head> <body> <i>Monthly Variance and Entropy</i></font> <table border='1' cellpadding='5' cellspacing='0'> <tr bgcolor='ffffcc'> <td><b>Period</b></td> <td align='center'><b>var(Hits)</b></td> <td align='center'><b>var(Visitors)</b></td> <td align='center'><b>Entropy</b></td> <td align='center'><b>MaxEnt</b></td> <td align='center'><b>Ratio</b></td> </tr> <?php $am = new ArrayMath; for($year=2004; $year<=2004; $year++) { for($month=1; $month<=12; $month++) { $start = date("Y-m-d", mktime(0,0,0,$month,1,$year)); $end = date("Y-m-d", mktime(0,0,0,$month+1,0,$year)); // Do stuff to get the entropy $clause = " received >= '$start' AND received <= '$end' "; $e->setWhere($clause); $e->getEntropy(); // Now, do stuff to get the variance $sql = " SELECT received, count(ip) AS hits, count(DISTINCT ip) AS visitors "; $sql .= " FROM Webstats "; $sql .= " WHERE received >= '$start' AND received <= '$end' "; $sql .= " GROUP BY received "; $res = &$db->query($sql); while ($row =& $res->fetchRow(DB_FETCHMODE_ASSOC)) { $hits[] = $row['hits']; $visits[] = $row['visitors']; } $hit_var = sprintf("%.2f", $am->variance($hits)); $vis_var = sprintf("%.2f", $am->variance($visits)); ?> <tr> <td align='right'><i><?php echo "$start to $end"; ?></i></td> <td align='right'><?php echo $hit_var ?></td> <td align='right'><?php echo $vis_var ?></td> <td align='right'><?php printf("%01.2f", $e->bits) ?></td> <td align='right'><?php printf("%01.2f", $e->maxent) ?></td> <td align='right'><?php printf("%01.2f", $e->ratio) ?></td> </tr> <?php $hit_vars[] = $hit_var; $vis_vars[] = $vis_var; $entropies[] = $e->bits; $hits = array(); $visits = array(); if($year == date("Y")) if($month == date("m")) break(2); } } ?> </table> <?php echo "correlation(hits, visits): ".$am->correlation($hit_vars,$vis_vars)."<br />"; echo "correlation(hits, entropy): ".$am->correlation($hit_vars,$entropies)."<br />"; echo "correlation(visits, entropy): ".$am->correlation($vis_vars,$entropies); ?> </body></html>⌨️ 快捷键说明
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