Also, use can be made of linked records (that is, survey responses can be analysed in the context of other administrative and survey data that is held about the relevant respondents).
Hefyd gellir defnyddio cofnodion cysylltiedig (hynny yw, gellir dadansoddi ymatebion i'r arolwg yng nghyd-destun data'r arolwg neu ddata gweinyddol eraill a gedwir am yr ymatebwyr dan sylw).