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The Data Detective

Tim Harford

Learn to test numbers by checking definitions, missing evidence, samples, algorithms, institutions, visual framing, and your own reactions. Harford turns statistical skepticism into disciplined curiosity.

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9 parts, about 22 minutes to read.

Why read it

  • Shows how misleading numbers arise from hidden definitions, missing evidence, biased samples and fragile algorithms, then teaches you how to investigate them
  • Uses cigarettes, vaccines, opinion polls, teacher scores and official statistics to show why careful measurement can reveal what intuition misses
  • Turns skepticism into curiosity by showing how to inspect charts, update beliefs and ask what the evidence actually measures

Who it is for

  • Readers who want practical habits for judging numbers in everyday life
  • Journalists and managers evaluating surveys, algorithms and performance metrics
  • Citizens navigating political claims without surrendering to reflexive cynicism

What the summary covers

  1. Look Through the Statistical Telescope2 min
  2. Correct the Observer2 min
  3. Define Before You Count2 min
  4. Recover the Missing Evidence4 min
  5. Question the Algorithm3 min
  6. Protect the Statistical Bedrock2 min
  7. Inspect the Picture2 min
  8. Make Updating a Practice3 min
  9. Be Curious2 min

Recommended by

  • Rutger BregmanDutch historian and author of Humankind
    Tim Harford is one of my favorite writers in the world.
  • Caroline Criado PerezWriter and author of Invisible Women
    If you aren’t in love with stats before reading this book, you will be by the time you’re done. Powerful, persuasive, and in these truth-defying times, indispensable
  • Stephen FryEnglish writer, actor and broadcaster
    Every politician and journalist should be made to read this book.
  • David SpiegelhalterUniversity of Cambridge emeritus professor of statistics
    What should we do when someone makes a claim that they say is based on data? This wise book, distilled from years of experience, gives us the ten commandments, from first examining our feelings, to finally having the humility to admit we may be wrong. Priceless
  • Malcolm GladwellNew Yorker staff writer and author of Outliers
    He's a genius at telling stories that illuminate our world

About the author

  • Tim HarfordFinancial Times senior columnist and BBC broadcaster
    • An economist, journalist and broadcaster who writes for the Financial Times and presents More or Less.
    • His Undercover Economist column explains the economic ideas behind everyday experiences.
    • He was the first Peter Martin Fellow at the Financial Times and later served on its editorial board from 2006 to 2009.
    • He previously worked for Shell and the World Bank.
    • He is an associate member of Nuffield College and an honorary fellow of Brasenose College and the Royal Statistical Society.
    • He was appointed OBE in 2019 for services to improving economic understanding.

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