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 2006 Scores and 2006 Transformed Provisional Scores, Grade 8 U.S. History National Assessment, by Scale: 2010

NAEP Technical DocumentationComparison means and percentiles of 2006 scores and 2006 transformed provisional scores, grade 8 U.S. history national assessment, by scale: 2010

Scale	Statistics	Original 2006 estimate	2006- transformed provisional estimate	Difference between the provisional estimate and the original estimate
# Rounds to zero. NOTE: 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. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2006 and 2010 U.S. History Assessments.
Composite scale	Mean	262.97	262.97	#
	10th percentile	220.69	220.80	0.11
	25th percentile	242.61	242.52	-0.09
	50th percentile	264.78	264.69	-0.09
	75th percentile	285.38	285.29	-0.09
	90th percentile	302.24	302.27	0.03
Democracy	Mean	260.95	260.95	#
	10th percentile	215.14	215.53	0.39
	25th percentile	238.56	238.30	-0.26
	50th percentile	262.43	262.14	-0.29
	75th percentile	285.48	285.30	-0.18
	90th percentile	304.13	304.28	0.15
Culture	Mean	266.97	266.97	#
	10th percentile	226.49	226.63	0.14
	25th percentile	248.02	247.88	-0.14
	50th percentile	269.12	268.88	-0.24
	75th percentile	288.22	288.11	-0.11
	90th percentile	304.00	304.14	0.14
Technology	Mean	258.28	258.28	#
	10th percentile	219.68	219.84	0.16
	25th percentile	239.97	240.00	0.03
	50th percentile	260.42	260.38	-0.04
	75th percentile	278.73	278.67	-0.06
	90th percentile	293.32	293.28	-0.04
World role	Mean	264.68	264.68	#
	10th percentile	214.71	214.83	0.12
	25th percentile	240.01	240.08	0.07
	50th percentile	266.35	266.36	0.01
	75th percentile	291.35	291.40	0.05
	90th percentile	311.65	311.46	-0.19

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