Impact of Asking Race Information in Mail Surveys
通过四个地区的实地实验，测量了在邮件调查中询问种族信息对响应率的影响，发现添加种族问题后响应率与对照组相同。
A field experiment was carried out in four regions to measure the impact of asking race information in a mail survey. The six-page questionnaire was identical between control and test groups except for the addition of questions on race information. The response rates for both groups were identical.