1.
Relating question type to panel conditioning: comparing trained and fresh respondents
2.
3.
4.
5.
Quality in unimode and mixed-mode designs: a multitrait-multimethod approach
Measurement and adjustment of non-response bias based on non-response surveys: the case of Belgium and Norway in the European Social Survey Round 3
6.
7.
8.
Incentives and ethnic minorities: results of a controlled randomized experiment in the Netherlands