As part of the survey changes, a revised weighting scheme has been introduced to improve efficiency, whilst making the results as representative as possible of the GB population.
Fel rhan o’r newidiadau i’r arolwg, cyflwynwyd cynllun pwysoli diwygiedig i wella effeithlonrwydd, gan sicrhau bod y canlyniadau mor gynrychiadol â phosibl o boblogaeth Prydain Fawr.