NAEP Analysis and Scaling → Scale Linking and Transformation to the Reporting Metric → Transformation Constants for NAEP Assessments → Coefficients of Linear Transformations of the Content-Dimension Scales From the Calibrating Scale Units to the Units of the Reporting Scale, Reading Vocabulary National Assessment: 2009

NAEP Technical DocumentationCoefficients of linear transformations of the content-dimension scales from the calibrating scale units to the units of the reporting scale, reading vocabulary national assessment: 2009

Grade	Scale1	A	B
1 The reading vocabulary scale was first operational in 2009. The reporting scale was therefore fixed  to have a mean of 250 and a standard deviation of 50. In that year a cross-grade scaling approach was used whereby all three grades were scaled together in a single calibration. The final 2009 results were transformed to the fixed reporting scale using these transformation constants. NOTE: Single overall scale. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2009 Reading Vocabulary Assessment.
4, 8, 12	OneScale	51.76	261.61

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