گزینههای پاسخ: Assessed, Absent, Excluded, Ineligible, Not in sample-Other reason, Not in sample-dropped replacement (participating original school), Not in sample-dropped replacement (participating replacement), Not in sample-dropped replacement (for ineligible school), Not in sample-dropped replacement (for excluded school), Not in sample-dropped original that can't be counted towards response rates but replacement could count, Not in sample-school with <25% student participation, other than those that fit the particular W_STUSTAT=95 situation, Not in sample-should have been an excluded school with only 1 or 2 PISA students, Not in sample-school exclusion because all students are excluded, Not in sample-school ineligible because all students are ineligible, 1