Respondent behavior in panel studies -: A case study for income nonresponse by means of the German Socio-Economic Panel (SOEP)

Many validation studies deal with item nonresponse and measurement error in earnings data. In this article, the author explores respondents' motives for failing to reveal earnings using the Get-man Socio-Economic Panel (SOEP). The SOEP collects socioeconomic information from private households in the Federal Republic of Germany. The author explains the evolution of income nonresponse in the SOEP and demonstrates the importance of discriminating between refusing to state income and responses of don't know.