NAEP Analysis and Scaling → Scale Linking and Transformation to the Reporting Metric → Comparisons of Distributions of Linking Samples for NAEP Assessments → Comparison of Means and Percentiles of 2007 Scores and 2007 Transformed Provisional Scores, Grade 12 Reading National Main Assessment, by Scale: 2009

Original estimates are based on previous assessment data and previous assessment scaling results, transformed to the reporting metric using the transformation identified during the analysis of the previous assessment data. Provisional estimates are based on previous assessment data and current assessment scaling results. These are on the theta metric specified by the scaling program. The original and provisional estimates for the linking sample are used to find the transformation constants necessary to place the current assessment scale scores on the scale used to report previous assessment scale scores. The transformed provisional estimates are based on previous assessment data and current assessment scaling results, transformed to the reporting metric using the transformation constants calculated from the original and provisional estimates for the linking sample. If the transformation constants are correct, the original and transformed provisional means should be the same.

NAEP Technical DocumentationComparison of means and percentiles of 2007 scores and 2007 transformed provisional scores, grade 12 reading national main assessment, by scale: 2009

Scale	Statistics	Original 2005 estimate	2005-transformed provisional estimate	Difference between the provisional estimate and the original estimate
# Rounds to zero. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2009 Reading Assessment.
Composite scale	Mean	286.03	286.03	#
	10th percentile	235.30	235.76	0.46
	25th percentile	261.93	261.63	-0.30
	50th percentile	288.17	288.12	-0.05
	75th percentile	312.67	312.65	-0.02
	90th percentile	333.05	333.18	0.13
Literary	Mean	278.85	278.85	#
	10th percentile	215.79	215.88	0.09
	25th percentile	248.18	248.11	-0.07
	50th percentile	281.51	281.53	0.02
	75th percentile	312.22	312.33	0.11
	90th percentile	338.17	338.20	0.03
Information	Mean	290.96	289.14	-1.82
	10th percentile	244.98	241.16	-3.82
	25th percentile	268.73	266.09	-2.64
	50th percentile	292.78	291.22	-1.56
	75th percentile	314.91	314.08	-0.83
	90th percentile	334.11	333.83	-0.28

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