/**
  * The getPublisherCampaignStatistics method returns campaign statistics for
  * a publisher for a specified period.
  *
  * @access public
  *
  * @param string $sessionId
  * @param integer $publisherId
  * @param date $oStartDate
  * @param date $oEndDate
  * @param recordSet &$rsStatisticsData  return data
  *
  * @return boolean
  */
 function getPublisherCampaignStatistics($sessionId, $publisherId, $oStartDate, $oEndDate, &$rsStatisticsData)
 {
     if ($this->verifySession($sessionId)) {
         return $this->_validateResult($this->_dllPublisher->getPublisherCampaignStatistics($publisherId, $oStartDate, $oEndDate, false, $rsStatisticsData));
     } else {
         return false;
     }
 }