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Schools assigned sessions in both assessment subjects occasionally turn out to be smaller than expected. As students may only be assessed in one subject, these schools are only large enough to administer one assessment subject. For these schools, the drop flag indicates what assessment subject session to drop. Schools assigned only a single session ignore the drop flag.
The drop flag assignment starts by sorting all sampled schools in the following order:
jurisdiction;
number of assessment sessions (in descending order);
sample type (S2 or S3); and
school identification number.
An alternating pattern assigns an assessment subject to each sorted school as its drop flag.