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 4 U.S. History National Assessment, by Scale: 2010

NAEP Technical DocumentationComparison means and percentiles of 2006 scores and 2006 transformed provisional scores, grade 4 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	211.24	211.24	#
	10th percentile	165.13	165.29	0.16
	25th percentile	188.69	188.54	-0.15
	50th percentile	213.44	213.66	0.22
	75th percentile	235.48	235.83	0.35
	90th percentile	253.56	253.49	-0.07
Democracy	Mean	218.58	218.58	#
	10th percentile	175.87	176.06	0.19
	25th percentile	197.33	197.49	0.16
	50th percentile	220.17	220.21	0.04
	75th percentile	241.13	241.20	0.07
	90th percentile	258.90	258.60	-0.30
Culture	Mean	200.87	200.86	#
	10th percentile	143.43	142.80	-0.63
	25th percentile	172.51	172.45	-0.06
	50th percentile	203.88	203.97	0.09
	75th percentile	231.57	231.77	0.20
	90th percentile	253.79	253.73	-0.06
Technology	Mean	213.59	213.59	#
	10th percentile	167.80	167.64	-0.16
	25th percentile	191.77	191.47	-0.30
	50th percentile	216.05	216.14	0.09
	75th percentile	237.85	237.78	-0.07
	90th percentile	255.51	255.60	0.09
World role	Mean	219.28	219.28	#
	10th percentile	183.88	183.47	-0.41
	25th percentile	201.35	201.33	-0.02
	50th percentile	220.25	220.45	0.20
	75th percentile	237.88	238.36	0.48
	90th percentile	253.38	253.20	-0.18

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