Data on absenteeism by persistent absentees and all pupils of compulsory school age (5 to 15) in maintained primary and secondary schools for September 2011 to August 2012.
Mae data am absenoldeb disgyblion sy’n absennol yn gyson a phob disgybl oedran ysgol gorfodol (5 i 15) mewn ysgolion cynradd ac uwchradd a gynhelir ar gyfer Medi 2011 i Awst 2012.