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Statistical Challenges in Online Controlled Experiments: A Review of A/B Testing Methodology

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  • Nicholas Larsen
  • Jonathan Stallrich
  • Srijan Sengupta
  • Alex Deng
  • Ron Kohavi
  • Nathaniel T. Stevens

Abstract

The rise of internet-based services and products in the late 1990s brought about an unprecedented opportunity for online businesses to engage in large scale data-driven decision making. Over the past two decades, organizations such as Airbnb, Alibaba, Amazon, Baidu, Booking.com, Alphabet’s Google, LinkedIn, Lyft, Meta’s Facebook, Microsoft, Netflix, Twitter, Uber, and Yandex have invested tremendous resources in online controlled experiments (OCEs) to assess the impact of innovation on their customers and businesses. Running OCEs at scale has presented a host of challenges requiring solutions from many domains. In this article we review challenges that require new statistical methodologies to address them. In particular, we discuss the practice and culture of online experimentation, as well as its statistics literature, placing the current methodologies within their relevant statistical lineages and providing illustrative examples of OCE applications. Our goal is to raise academic statisticians’ awareness of these new research opportunities to increase collaboration between academia and the online industry.

Suggested Citation

  • Nicholas Larsen & Jonathan Stallrich & Srijan Sengupta & Alex Deng & Ron Kohavi & Nathaniel T. Stevens, 2024. "Statistical Challenges in Online Controlled Experiments: A Review of A/B Testing Methodology," The American Statistician, Taylor & Francis Journals, vol. 78(2), pages 135-149, April.
    • Handle: RePEc:taf:amstat:v:78:y:2024:i:2:p:135-149
    DOI: 10.1080/00031305.2023.2257237
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