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Footnote: * See Ray (1997) for more detail about the non-equal-interval nature of a simple percentile scale which has distortion especially near the ends of the scale.
** Public school achievement data are for eighth grade based on tables from the U.S. Department of Education, Office of Educational Research & Improvement, National Center for Education Statistics (1996, November). National Assessment of Educational Progress (NAEP) trends in academic progress [trends report and appendices]. Washington, DC: U.S. Department of Education.
Home school data are for grades K-12.
Copyright © 1997 Brian D. Ray & HSLDA
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