Quality requires skilled professional judgement about collecting, preparing, analysing and publishing statistics and data in ways that meet the needs of people who want to use the statistics.
Mae ansawdd yn gofyn am grebwyll proffesiynol medrus wrth gasglu, paratoi, dadansoddi a chyhoeddi ystadegau a data mewn ffyrdd sy'n bodloni anghenion pobl sydd am ddefnyddio'r ystadegau.