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  • Feb
    6

    IEMS Seminar - Zeyu Zheng

    Department of Industrial Engineering and Management Sciences (IEMS)

    11:00 AM A230, Technological Institute

    EVENT DETAILS

    Title: Non-stationary A/B Tests

    Abstract: A/B tests, also known as online randomized controlled experiments, have been used at scale by data-driven enterprises to guide decisions and test innovative ideas. Non-stationarities, such as the time-of-day effect, the day-of-week effect, and longer-term trends, can often arise nonparametrically in core business metrics. We discuss in this presentation the impact of non-stationarities on A/B tests. We argue that inadequately addressing non-stationarities can lead to wrong decisions and missed opportunities. We discuss some scenarios where the challenges brought by non-stationarities may be appropriately addressed.

    Bio: Zeyu Zheng is an assistant professor at UC Berkeley, Department of Industrial Engineering and Operations Research since 2018. He received a PhD in Management Science and Engineering (2018), PhD minor in Statistics (2018), and MS in Economics (2016) from Stanford University, and BS in Mathematics (2012) from Peking University. He serves as an Associate Editor for Operations Research, Probability in the Engineering and Informational Sciences. His research group currently works on simulation, experiment design and inference, generative AI, stochastic optimization and non-stationary modeling.

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    TIME Tuesday, February 6, 2024 at 11:00 AM - 12:00 PM

    LOCATION A230, Technological Institute    map it

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    CONTACT Kendall Minta    kendall.minta@gmail.com EMAIL

    CALENDAR Department of Industrial Engineering and Management Sciences (IEMS)

  • Sep
    8

    Welcome & Breakfast for New McCormick PhD Students

    McCormick School of Engineering and Applied Science

    9:00 AM LR2 & Tech East Plaza, Technological Institute

    EVENT DETAILS

    TIME Monday, September 8, 2025 at 9:00 AM - 10:00 AM

    LOCATION LR2 & Tech East Plaza, Technological Institute    map it

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    CONTACT Andi Joppie    andi.joppie@northwestern.edu EMAIL

    CALENDAR McCormick School of Engineering and Applied Science

  • Sep
    12

    New Undergraduate Fall 2025 Registration

    University Academic Calendar

    All Day

    EVENT DETAILS

    TIME Friday, September 12, 2025

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    CONTACT Office of the Registrar    nu-registrar@northwestern.edu EMAIL

    CALENDAR University Academic Calendar

  • Sep
    15

    Welcome & Luncheon for New Full-time Graduate Students

    McCormick School of Engineering and Applied Science

    11:00 AM Ryan Auditorium & Tech East Plaza, Technological Institute

    EVENT DETAILS

    TIME Monday, September 15, 2025 at 11:00 AM - 12:30 PM

    LOCATION Ryan Auditorium & Tech East Plaza, Technological Institute    map it

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    CONTACT Andi Joppie    andi.joppie@northwestern.edu EMAIL

    CALENDAR McCormick School of Engineering and Applied Science

  • Sep
    16

    Fall Classes Begin. Change of Registration (Drop/Add) Late registration for returning students begins

    University Academic Calendar

    All Day

    EVENT DETAILS

    TIME Tuesday, September 16, 2025

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    CONTACT Office of the Registrar    nu-registrar@northwestern.edu EMAIL

    CALENDAR University Academic Calendar