To adjust for these differences, non-response weights were calculated, using a random iterative method (RIM), and applied to bring the survey profile in line with the sample.
I addasu ar gyfer y gwahaniaethau hyn, cyfrifwyd pwysau diffyg ymateb, gan ddefnyddio dull ailadroddol ar hap, a'u cymhwyso i gysoni proffil yr arolwg â'r sampl.