public function getAverageYears()
{
/*get average number of years a student stays in the university
1. get number of students with studentterms, remove dropouts
2. get number of years of each student by dividing number of terms by 3
3. get average of step 2 (accdng to a site, sum/count is faster than avg command)
*/
$numberOfYearsPerStudent = Studentterm::getNumberofYears();
$numberOfStudents = count($numberOfYearsPerStudent);
$totalYears = 0;
foreach ($numberOfYearsPerStudent as $key => $val) {
$totalYears = $totalYears + $val->numyears;
}
$aveYearsOfStay = round($totalYears / $numberOfStudents, 2);
return $aveYearsOfStay;
}
