simulated 6 different pattern of nonresponse bias and investigated the fade-away effect across the waves 2006 to 2009. We found … remarkable differences between these 25 coun- tries. Expressed by the relative bias, i.e. bias in 2009 divided by bias at start … in 2006, we found a reduction down to 26 percent of the initial bias for Bulgaria (foremost reduction) up to 61 percent …

register data. Therefore we use the unique dataset ALWA-ADIAB, which combines interview data and process-produced data from …

collection. As a result of the bias that non-response sometimes introduces in survey estimates, identifying factors that promote …