We check against other published sources, either from the Welsh Government or other organisations such as the Office for National Statistics or the Department for Work and Pensions.
Rydym yn gwirio yn erbyn ffynonellau cyhoeddedig eraill, naill ai o Lywodraeth Cymru neu o gyrff eraill megis y Swyddfa Ystadegau Gwladol neu’r Adran Gwaith a Phensiynau.