Twenty-four per cent of 457 sequential IQ assessments contained errors in the calculation of verbal, performance or full scale IQ's from the raw scores; in 2% the errors were large enough to cause a difference in full scale IQ of more than 5 points.
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http://dx.doi.org/10.1111/j.1469-7610.1988.tb00693.x | DOI Listing |
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