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Sample Bias

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Bad Measurement

Garbage In: What Makes Bad Data • 4m 53s

Up Next in Garbage In: What Makes Bad Data

  • Sample Bias

    If your sample is biased, it doesn't matter very much what you do with it. With selection bias, sample bias, and more, it's a lot easier to get a biased sample than get a representative one.

  • Problems with Variance

    If every employee gets a positive evaluation, then what is the purpose of the evaluation in the first place? Without variance in data, we can't really draw any conclusions about what data means. Yet often in the workplace we value consistency so much that we drive variance out of key measures. Th...

  • Too Much Story

    The desire to tell a certain story through our data can lead us to manipulate results and create a misleading picture. Don't let the pressure to succeed overwhelm your commitment to understanding the world as it is.