public function seedHighGrades($batches, $allStudents, $departmentid)
 {
     foreach ($batches as $batch) {
         $students = $allStudents[$batch];
         $totalHigh = 0;
         foreach ($students as $student) {
             $gwa = Studentterm::getOneGradesDepartment($student->studentid, $departmentid);
             if ($gwa > 1.0 || $gwa < 3.0) {
                 $totalHigh++;
             }
         }
         $newCorrelation = new Correlation();
         $newCorrelation->factorid = 7;
         $newCorrelation->batch = $batch;
         $countStudents = count($students);
         if ($countStudents > 0) {
             $newCorrelation->ratio = $totalHigh / $countStudents;
         } else {
             $newCorrelation->ratio = 0;
         }
         $newCorrelation->unittype = 'department';
         $newCorrelation->departmentid = $departmentid;
         $newCorrelation->save();
     }
 }