Total primary (or secondary) school age children who are not enrolled (because they never enrolled or because they dropped-out) in primary or secondary education expressed as a percentage of the official school-age population corresponding to the primary (or secondary) level in a given school-year. Children enrolled in pre-primary education are excluded and considered out-of-school (Source: UIS)
Gross tertiary graduation ratio (only applicable for first degrees) is the total number of graduates in tertiary International Standard Classification of Education (ISCED) 5A programmes expressed as a percentage of the total population of the age at which students theoretically finish their first degree programme, in a given country
GER is the ratio of total enrolment, regardless of age, to the population of the age group that corresponds to the same level of education. GER can exceed 100% due to the inclusion of over-aged and under-aged students, because of early or late school entrance, and grade repetition. For the tertiary level, the population used is the 5-year age group starting from the official secondary school graduation age (Source: UIS, Education Indicators - Technical Guidelines: p.9)
Percentage of students at the lowest level of science proficiency is the percentage of students at the lowest level of proficiency on the science scale in national or international assessments
Percentage of students at the lowest level of mathematics proficiency is the percentage of students at the lowest level of proficiency on the mathematics scale in national or international assessments
Percentage of students at the lowest level of reading proficiency is the percentage of students at the lowest level of proficiency on the reading scale in national or international assessments
Mean performance on the mathematics scale is the mean mathematics score for students in national or international assessments
Mean performance on the science scale is the mean science score for students in national or international assessments
Mean performance on the reading scale is the mean reading score for students in national or international assessments
The percentage of students who achieve the lowest passable grade or above in examinations taking place in the final year of secondary school (Source: Audrey Chapman (2007) Development of Indicators for Economic, Social and Cultural Rights: The Rights to Education, Participation in Cultural Life and Access to the Benefits of Science: p.152)