Statws B
Pwnc:
Addysg
Ffynhonnell:
TermCymru
Enw, Gwrywaidd, Unigol
Quartiles are the values that divide a list of numbers into quarters, e.g. The pilot model bands scores by ranking performance against each data item across Wales and splitting the ranks into quartiles – 1 (highest) – 4 (lowest).