Adjusting undercoverage and nonresponse bias in telephone surveys / Fannie Cobben and Jelke BethlehemMode effects in a basic question approach for the Dutch LFS / Fannie CobbenA follow-up with basic questions of nonrespondents to the Dutch labour force survey / Fannie Cobben and Barry SchoutenAn empirical validation of R-indicators / Fannie Cobben, Barry SchoutenNonresponse in sample surveys : methods for analysis and adjustment / Fannie CobbenNonresponse in sample surveys : methods for analysis and adjustment