Field experiments have proliferated throughout the social sciences and have become a mainstay for identifying racial discrimination during the hiring process. To date, field experiments of labor market discrimination have generally drawn their sample of job postings from limited sources, often from a single major online job posting website. While providing a large pool of job postings across labor markets, this narrow sampling procedure leaves open questions about the generalizability of the findings from field experiments of racial discrimination in the extant literature. In this paper, we present evidence from a field experiment examining racial discrimination in the hiring process that draws its sample from two sources: (1) a national online job posting website that aligns with previous research, and (2) a job aggregator service that scrapes the web daily in an effort to obtain all online job postings in the United States. While differing in the types of information they collect, we find the job postings drawn from the two sources result in similar estimates of discrimination against Black applicants. In other words, we do not find evidence that racial discrimination varies by the source of the job posting. We conclude by discussing the implications of these findings for studies of racial discrimination, discrimination along other axes of social difference, as well as field-experimental methods more broadly.

现场实验在整个社会科学领域激增，并已成为在招聘过程中识别种族歧视的主要手段。迄今为止，劳动力市场歧视的现场实验通常从有限的来源中抽取招聘信息样本，通常来自一个主要的在线招聘信息网站。在提供大量跨劳动力市场的招聘信息的同时，这种狭窄的抽样程序留下了关于现有文献中种族歧视实地实验结果的普遍性的悬而未决的问题。在本文中，我们提供了来自调查招聘过程中种族歧视的现场实验的证据，该实验从两个来源抽取样本：(1) 与先前研究一致的国家在线招聘网站，(2) 一种工作聚合服务，它每天都在网络上抓取数据，以获取美国的所有在线职位发布信息。虽然他们收集的信息类型不同，但我们发现从这两个来源中提取的招聘信息导致对黑人求职者歧视的估计相似。换句话说，我们没有找到证据表明种族歧视因职位发布的来源而异。最后，我们讨论了这些发现对种族歧视、其他社会差异轴上的歧视以及更广泛的现场实验方法的研究的影响。我们发现从这两个来源中提取的职位发布导致对黑人申请人的歧视的估计相似。换句话说，我们没有找到证据表明种族歧视因职位发布的来源而异。最后，我们讨论了这些发现对种族歧视、其他社会差异轴上的歧视以及更广泛的现场实验方法的研究的影响。我们发现从这两个来源中提取的职位发布导致对黑人申请人的歧视的估计相似。换句话说，我们没有找到证据表明种族歧视因职位发布的来源而异。最后，我们讨论了这些发现对种族歧视、其他社会差异轴上的歧视以及更广泛的现场实验方法的研究的影响。