In addition, it is argued that the current practice of expressing confidence limits on test scores on a standard score metric should be supplemented with confidence limits expressed as percentile ranks, because the latter provide a more direct and tangible indication of the uncertainty surrounding an observed score. We advocate that, in addition to expressing scores on a standard metric, neuropsychologists should also routinely record the percentile rank of all test scores so that the latter are available when attempting to reach a formulation. Individual children who are tested using the WISC-IV or WPPSI-III can get. Typically percentiles are reported as whole numbers so the highest percentile possible would be 99 and the lowest possible would be 11. The graph below shows a how scores on IQ tests are distributed amongst humans. That is, 50 of the scores are lower than the median, and 50 of the scores are higher than the median. find a chart correlating WISC IV FSIQ scores to percentiles I know I have seen it before but can t seem to locate it now. As a result, there is a danger of losing sight of the fundamentals: percentile ranks express scores in a form that is of greater relevance to the neuropsychologist than any alternative metric because they tell us directly how common or uncommon such scores are in the normative population. The median for any set of raw scores is the 50th percentile.
Many commentators on neuropsychological assessment stress the disadvantages of expressing test scores in the form of percentile ranks.
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