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Are the National DIBELS Data System percentiles the same as national percentiles?

April 26, 2017Data DIBELS National percentiles system

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Are the National DIBELS Data System percentiles the same as national percentiles?

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National percentiles are calculated from a randomly selected sample. The National DIBELS Data System percentiles are calculated from nationally representative samples but the samples are not random since the scores are from schools that chose to use the DIBELS Data System.