At upper secondary level of education, the survey adopted and countries adhered to a probabilistic two-stages cluster sampling design with selection of schools (at Stage 1) and of teachers within schools (at Stage 2) (OECD 2013a, b, 2014a, b).
At lower secondary level 37% of students are girls; at upper secondary level, 32% and very few girls complete secondary school.
Pupils' feasible set of vocational alternatives is restricted not only in terms of the type of school attended at lower secondary level but the recruitment strategy and selection criteria of employers when filling vacant apprenticeships.
The Units and Levels of Selection: Samir Okasha (University of Bristol .III.5.
At secondary level, just 14% of young people in poor countries complete their studies.
Our model indicates that, although these hypotheses might work at a secondary level, they are not strictly necessary to explain the selection of APOE alleles.
He said: "At secondary level there are a lot of differences.
Government data shows the number of applications at secondary level was at its highest since 2008.
Pupil numbers at secondary level are currently decreasing, affecting the number of appeals.
Only 10percentt of students at the secondary level nationally end up enrolling in music classes.
