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msd2/tracking/piwik/plugins/Actions/Columns/Metrics/BounceRate.php

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+<?php
+/**
+ * Piwik - free/libre analytics platform
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ */
+namespace Piwik\Plugins\Actions\Columns\Metrics;
+
+use Piwik\DataTable\Row;
+use Piwik\Metrics\Formatter;
+use Piwik\Piwik;
+use Piwik\Plugin\ProcessedMetric;
+
+/**
+ * The bounce rate for individual pages. Calculated as:
+ *
+ *     entry_bounce_count (single page visits on this page) / entry_nb_visits (all visits that started on this page)
+ *
+ * entry_bounce_count & entry_nb_visits are calculated by the Actions archiver.
+ */
+class BounceRate extends ProcessedMetric
+{
+    public function getName()
+    {
+        return 'bounce_rate';
+    }
+
+    public function getTranslatedName()
+    {
+        return Piwik::translate('General_ColumnBounceRate');
+    }
+
+    public function compute(Row $row)
+    {
+        $entryBounceCount = $this->getMetric($row, 'entry_bounce_count');
+        $entryVisits = $this->getMetric($row, 'entry_nb_visits');
+
+        return Piwik::getQuotientSafe($entryBounceCount, $entryVisits, $precision = 2);
+    }
+
+    public function format($value, Formatter $formatter)
+    {
+        return $formatter->getPrettyPercentFromQuotient($value);
+    }
+
+    public function getDependentMetrics()
+    {
+        return array('entry_bounce_count', 'entry_nb_visits');
+    }
+}