Teacher evaluations and superstition

posted by
December 28, 2010
by Arnold Kling  
Posted in Commentary

"There is a term that Daniel Klein alerted me to called 'white hat bias.' What it means is that findings that favor a popular political viewpoint will be published, while those that contradict that viewpoint will tend to be discarded. So many people have a vested interest in believing that teachers make a difference that one has to be very wary of white hat bias in studies that purport to show such differences." (12/28/10)



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