Harlan D. Harris
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  • Communicating A/B Test Results for Conversion Rates with Ratios and Uncertainty Intervals

    calendar Aug 20, 2022 · 8 min read · a/b testing data science statistics  ·
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    A/B testing is a tool for supporting decision-making in business, and so in addition to getting the statistics right, it’s really important to communicate well with the non-statisticians who will have the final say on the go/no-go decision. Most A/B tests in practice are testing ratios, conversion rates of various …


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  • A/B Testing and Product Ratings, Part 2: Multiple Ratings

    calendar May 23, 2022 · 3 min read · data science analytics business statistics a/b testing  ·
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    Second, your A/B test split users, but you’re measuring ratings, which are per-item. Some customers will buy multiple pairs of shoes, and most likely will either rate all of them or none of them. Does this fact affect how confident you can be at the end of the experiment? Randomization Unit Mis-Match A/B tests are …


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  • A/B Testing and Product Ratings, Part 1: Delays and Bias

    calendar May 22, 2022 · 7 min read · data science analytics business statistics a/b testing  ·
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    Suppose you’re a data scientist at an e-commerce web site that sells shoes, responsible for supporting A/B tests. Many A/B tests are easy, and there are a number of companies that sell tools that make the easy cases as simple as clicking a few buttons and looking at pretty graphs. But A/B tests can get statistically …


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  • intuitive visualizations of categorization for non-technical audiences

    calendar Apr 25, 2011 · 8 min read · analytics dataviz ggplot2 graphics predictive R visualization statistics  ·
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    For a project I’m working on at work, I’m building a predictive model that categorizes something (I can’t tell you what) into two bins. There is a default bin that 95% of the things belong to and a bin that the business cares a lot about, containing 5% of the things. Some readers may be familiar with the use of …


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  • On "Analytics" and related fields

    calendar Apr 15, 2011 · 6 min read · conferences data science job titles operations research statistics  ·
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    I recently attended the INFORMS Conference on Business Analytics and Operations Research, aka “INFORMS Analytics 2011”, conference in Chicago. This deserves a little bit of an explanation. INFORMS is the professional organization for Operations Research (OR) and Management Science (MS), which are terms describing …


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  • "Data Scientist" and other titles

    calendar Feb 13, 2011 · 3 min read · data science job titles statistics  ·
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    Neil Saunders has an interesting (to me) blog post up this morning, with the title “Dumped on by data scientists.” He uses the use of “data scientist” in a Chronicle of Higher Ed article to rant a little bit about the term. For Neil, it’s redundant, as the act of doing science necessarily requires data; it’s insulting, …


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  • Prediction with Multilevel Regression Models, and Pizza

    calendar Oct 15, 2010 · 3 min read · meetup statistics R  ·
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    The Meetup phenomenon, which is now substantial and longstanding enough to be more of a cultural change than a flash in the pan, continues to impress me. Even more so than tools like LinkedIn, Meetups have changed the nature of professional networking, making it more informal, diverse, and decentralized. Last night, …


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Featured Posts

  • Communicating A/B Test Results for Conversion Rates with Ratios and Uncertainty Intervals
  • Staff Data Scientist: Comments on Will Larson's Staff Engineer Book

Recent Posts

  • Communicating A/B Test Results for Conversion Rates with Ratios and Uncertainty Intervals
  • Staff Data Scientist: Comments on Will Larson's Staff Engineer Book
  • A/B Testing and Product Ratings, Part 1: Delays and Bias
  • New Publications and Upcoming Talks
  • Stovetop Smoked Chinese Fish
  • How I Rewrite Recipes
  • On moving my blog from Wordpress to Blogdown
  • On How and When to Teach Layers of Abstraction in Programming

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Harlan D. Harris

Copyright 2009-  HARLAN D. HARRIS. This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License

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