/**
     * @inheritdoc
     */
    protected function calcData()
    {
        $results = \Yii::app()->getDb()->createCommand($this->makeSqlQuery())->query();

        $statistic = [];
        foreach ($results as $result) {
            $stat = new \stdClass();
            $stat->category = $this->makeGroupName($result['Start'], $result['End']);
            $stat->column =  $result['Count'];

            $statistic[] = $stat;
        }
        $this->setChartData($statistic);

        return (int)(max(\user\models\User::model()->count(['condition' => 'NOT "Deleted"']), 20000)/1000);
    }

    /**
     *
     * @param array $stat
     */
    private function setChartData(array $stat)
    {
        \Yii::app()->getClientScript()->registerScript('chart-ages', '
        var usersByAges = ' . json_encode($stat), \CClientScript::POS_HEAD);
    }