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Li Tan·谭李·Lin.
Essays

Essays · 文章

Long-form notes on measurement, experimentation, and AI-augmented analytics.

2026 1 essays
  1. The Hallucinations Hiding in My Pipeline AI writes code that looks right. Sometimes it is. Often it is not. Your job is to catch it. The AI is only as good as you are at reviewing it. 3 min read
2025 9 essays
  1. Beyond A/B Testing: How I Analyze Real Product Impact Without an Experiment When you cannot randomize, causal inference still gets you closer to the truth. Here is my playbook. 2 min read
  2. From Insights to Actions The hardest part of analytics is not finding the insight. It is getting someone to act on it. 2 min read
  3. A Few Thoughts on DMA Tests Geo tests are one of the most powerful tools for measuring marketing lift. They are also easy to get wrong. Some notes from the field. 2 min read
  4. Is AI Ready to Replace Marketing Data Analysts? Every week another headline says yes. I use AI every day. Here is my honest take. 2 min read
  5. Between MTA and LTA The attribution debate never ends. Here is how I think about it. 2 min read
  6. Quick Walkthrough on Anomaly Detection People think anomaly detection is fancy. Most of the time, it is not. 2 min read
  7. A Brief Intro to Building MMM with Agencies How to work with an agency on Marketing Mix Modeling without losing control of the methodology. 2 min read
  8. Experience Reporting to VPs and Above Early in my career I made every mistake possible presenting to execs. Here is what I learned the painful way. 2 min read
  9. Is Marketing an Art or Science? I get asked this at every conference. Here is my honest answer. 2 min read
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