Problém nízké návratnosti výběrových dotazovacích šetření

A low response rate is regarded as one of the main sources of variable variance and bias in mass survey estimates. There is a consensus among scholars and pollsters that response-rate trends have been declining, and that this fact poses one of the most serious problems affecting contemporary quantitative social science research. Since the mid-1990s there has been a dramatic decline in the response rates also of sample surveys conducted in the Czech Republic.