
When it comes to errors in human judgment, we tend to focus on bias, but noise is also a cause of error. Bias is the average of errors committed by a group. You need to know the right answer to know what the bias is. Bias is systemic and predictable. Noise, on the other hand, is variable amongst a group of judgements. You can tell there’s noise even if you don’t know the right answer. It’s unpredictable and not easily explained.
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