Under the Code of Practice for Official Statistics, decisions on the content and publication of statistical outputs are made by the Chief Statistician, independent of Ministers.
O dan y Cod Ymarfer ar gyfer Ystadegau Swyddogol, y Prif Ystadegydd sy'n penderfynu ar gynnwys yr allbynnau ystadegol a'r hyn sy'n cael ei gyhoeddi, a hynny’n annibynnol ar Weinidogion.