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Autoren: 
Grewenig, Elisabeth
Lergetporer, Philipp
Simon, Lisa
Werner, Katharina
Woessmann, Ludger
Datum: 
2018
Schriftenreihe/Nr.: 
Discussion Paper No. 117
Zusammenfassung: 
A general concern with the representativeness of online surveys is that they exclude the \"offline\" population that does not use the internet. We run a large-scale opinion survey with (1) onliners in web mode, (2) offliners in face-to-face mode, and (3) onliners in face-to-face mode. We find marked response differences between onliners and offliners in the mixed-mode setting (1 vs. 2). Response differences between onliners and offliners in the same face-to-face mode (2 vs. 3) disappear when controlling for background characteristics, indicating mode effects rather than unobserved population differences. Differences in background characteristics of onliners in the two modes (1 vs. 3) indicate that mode effects partly reflect sampling differences. In our setting, re-weighting online-survey observations appears a pragmatic solution when aiming at representativeness for the entire population.
Schlagwörter: 
online survey
representativeness
mode effects
offliner
public opinion
JEL: 
C83
D91
I20
Dokumentart: 
Working Paper

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