Varun's blog
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  • Dec 6, 2025

    Against CUPED

  • Nov 24, 2025

    Turning a big dial and constantly looking back at the audience

  • Nov 15, 2025

    Chart go up

  • Oct 10, 2025

    Mistakes in data team mathematics

  • Jul 27, 2025

    How is my feature doing?

  • Feb 28, 2025

    A/B testing and time

  • Jan 25, 2025

    Trending towards significance, revisited

  • Jan 5, 2025

    Running experiments with small sample size

  • Dec 5, 2024

    A graphical exploration of power, type S, and type M errors

  • Oct 14, 2024

    How to evaluate a quantitative claim

  • Sep 15, 2024

    The dual mandate of A/B testing

  • Jun 22, 2024

    How to find the sample size for an A/B test

  • May 20, 2024

    The Bayesian Euro step

  • Jan 25, 2024

    Reflections On Data Science In Big Tech

  • Nov 1, 2023

    Why no one writes unit tests for data

  • Nov 8, 2022

    Simple pandas

  • Nov 27, 2021

    A random walk down Wall Street

  • Aug 14, 2021

    Sic transit

  • Dec 25, 2020

    Adventures in incremental dbt

  • Dec 21, 2020

    Retry-driven development

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Varun's blog

  • Varun's blog
  • varun.p.rajan@gmail.com
  • varunprajan

Data science + data engineering posts