Evaluating the response effort and data quality of established political solidarity measures: a pre-registered experimental test in an online survey of the German adult resident population in 2021.

This experimental study aims to check and improve the quality of 16 established survey measures of political solidarities and related concepts, such as redistribution and social trust. Political solidarities are defined as one's willingness to share the costs that result from public redistribution that favours people other than oneself and thus constitute a subset of welfare state attitudes. The pre-registered study plan included suggestions for the development of improved rating scales, which we defined as five-point, end verbalized rating scales without non-substantive answer options. The overall results from an experimental online survey in Germany indicate differences in response effort in terms of response times but almost no differences in data quality in terms of criterion validity. Thus, the 16 survey measures show solid instrument validity as well as minor improvements in respondents' response times. Indeed, the measures are (at least) in the online survey world of Germany of high-quality and warrant inclusion in future surveys with small efficiency gains still attainable.