Bydd hyn yn sail i ddadansoddi’r gwahaniaethau rhwng ffynonellau eraill, megis yCyfrifiad Ysgol Blynyddol ar Lefel DisgyblionacArolwg Cenedlaethol Cymru.
This will be a basis for analysing the differences between other sources, such as thePupil Level Annual School Censusand theNational Survey for Wales.