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NAEP Analysis and Scaling → Scale Linking and Transformation to the Reporting Metric → Comparisons of Distributions of Linking Samples for NAEP Assessments → Comparison Means and Percentiles of 2001 Accomodation-Permitted Sample Scores and 2001 Transformed Provisional Scores, Grade 12 U.S. History Assessment, by Scale: 2006

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 means and percentiles of 2001 accommodation-permitted sample scores and 2001 transformed provisional scores, grade 12 U.S. history assessment, by scale: 2006

Scale	Statistic	Original 2001 estimate	2001 transformed provisional estimate	Difference between the 2001 transformed provisional estimate and the 2001 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), 2006 U.S. History Assessment.
Composite scale	Mean	286.60	286.60	#
	10th percentile	244.06	244.44	0.38
	25th percentile	265.64	265.63	-0.01
	50th percentile	288.18	288.30	0.12
	75th percentile	308.82	309.04	0.22
	90th percentile	326.49	326.32	-0.17
Democracy	Mean	288.45	288.45	#
	10th percentile	232.53	232.66	0.13
	25th percentile	260.75	260.53	-0.22
	50th percentile	290.15	290.20	0.05
	75th percentile	317.77	317.76	-0.01
	90th percentile	341.32	341.59	0.27
Cultures	Mean	284.98	284.98	#
	10th percentile	251.20	251.20	#
	25th percentile	268.66	268.72	0.06
	50th percentile	286.52	286.54	0.02
	75th percentile	302.69	302.85	0.16
	90th percentile	316.11	316.23	0.12
Technology	Mean	286.02	286.02	#
	10th percentile	248.22	247.96	-0.26
	25th percentile	267.31	267.52	0.21
	50th percentile	287.38	287.65	0.27
	75th percentile	306.06	306.12	0.06
	90th percentile	321.64	321.70	0.06
World role	Mean	286.96	286.96	#
	10th percentile	239.48	239.74	0.26
	25th percentile	262.99	263.18	0.19
	50th percentile	288.19	288.33	0.14
	75th percentile	311.97	312.05	0.08
	90th percentile	332.17	331.87	-0.30

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