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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 8 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 8 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	260.21	260.21	#
	10th percentile	215.69	216.03	0.34
	25th percentile	238.62	238.71	0.09
	50th percentile	262.05	261.98	-0.07
	75th percentile	283.67	284.01	0.34
	90th percentile	302.03	301.80	-0.23
Democracy	Mean	257.86	257.86	#
	10th percentile	212.34	211.94	-0.40
	25th percentile	235.22	235.21	-0.01
	50th percentile	259.52	259.13	-0.39
	75th percentile	282.32	282.61	0.29
	90th percentile	301.48	301.44	-0.04
Cultures	Mean	264.67	264.68	0.01
	10th percentile	221.99	222.18	0.19
	25th percentile	244.28	244.65	0.37
	50th percentile	267.05	267.01	-0.04
	75th percentile	287.34	287.34	0.00
	90th percentile	303.97	303.90	-0.07
Technology	Mean	258.66	258.66	#
	10th percentile	216.93	217.03	0.10
	25th percentile	238.98	238.86	-0.12
	50th percentile	260.86	260.96	0.10
	75th percentile	280.70	280.64	-0.06
	90th percentile	296.87	296.78	-0.09
World role	Mean	258.57	258.57	#
	10th percentile	203.29	203.02	-0.27
	25th percentile	230.76	230.95	0.19
	50th percentile	259.86	260.03	0.17
	75th percentile	288.16	288.07	-0.09
	90th percentile	312.14	311.83	-0.31

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