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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 4 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 4 U.S. history assessment, by scale: 2006

Scale	Statistic	Original 2001 estimate	2001 transformed provisional estimate	Difference between the 2001 transformed provisional estimate and 2001 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), 2006 U.S. History Assessment.
Composite scale	Mean	207.93	207.94	0.01
	10th percentile	157.39	157.13	-0.26
	25th percentile	183.76	183.99	0.23
	50th percentile	210.76	210.66	-0.10
	75th percentile	234.44	234.70	0.26
	90th percentile	254.18	254.37	0.19
Democracy	Mean	213.22	213.22	#
	10th percentile	166.12	165.72	-0.40
	25th percentile	190.34	190.42	0.08
	50th percentile	215.52	215.15	-0.37
	75th percentile	238.15	238.23	0.08
	90th percentile	257.27	257.62	0.35
Cultures	Mean	200.95	200.95	#
	10th percentile	139.85	139.19	-0.66
	25th percentile	171.78	171.88	0.10
	50th percentile	204.39	204.16	-0.23
	75th percentile	233.34	232.98	-0.36
	90th percentile	257.11	257.56	0.45
Technology	Mean	211.11	211.11	#
	10th percentile	157.93	157.89	-0.04
	25th percentile	186.65	186.80	0.15
	50th percentile	214.52	214.61	0.09
	75th percentile	238.59	238.67	0.08
	90th percentile	258.08	258.95	0.87
World role	Mean	210.13	210.13	#
	10th percentile	167.34	166.87	-0.47
	25th percentile	188.61	188.94	0.33
	50th percentile	211.02	211.24	0.22
	75th percentile	232.84	232.99	0.15
	90th percentile	252.17	251.78	-0.39

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