Psychology / Unit 1 Psych 0058 short lesson, about 20 seconds
Blind Coding
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The idea
Blind coding has observations recorded by someone who does not know which condition or group the case belongs to.
In practice
Video of children at play is scored by raters told nothing about the study's hypothesis.
Where people slip
Observer bias is rarely dishonesty. It is ordinary perception, which is why the fix is procedural rather than moral.
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