Census 2021 has been accredited as National Statistics and underwent a rigorous accreditation process (ONS) with the OSR.
Mae Cyfrifiad 2021 wedi cael ei achredu fel Ystadegau Gwladol a bu’n destun proses achredu drylwyr (SYG) gyda’r Swyddfa Rheoleiddio Ystadegau.