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NAEP Analysis and Scaling → Scale Linking and Transformation to the Reporting Metric → The Transformation Equation → Comparisons of Distributions of Linking Samples for NAEP Assessments → Comparison means and percentiles of 1994 and 1994 transformed provisional scores, grade 4 U.S. history assessment: 2001

NAEP Technical DocumentationComparison Means and Percentiles of 1994 and 1994 Transformed Provisional Scores, Grade 4 U.S. History Assessment: 2001

Scale	Statistic	Original 1994 estimate	1994 transformed provisional estimate	Difference between the provisional estimate and the original estimate
Composite	Mean	204.62	204.62	0.00
	10th percentile	146.58	147.81	1.24
	25th percentile	179.94	179.51	-0.44
	50th percentile	209.61	208.79	-0.82
	75th percentile	234.15	233.92	-0.23
	90th percentile	253.03	253.77	0.74
Democracy	Mean	207.82	207.82	0.00
	10th percentile	155.58	156.16	0.58
	25th percentile	184.87	183.93	-0.94
	50th percentile	212.24	210.71	-1.52
	75th percentile	234.93	234.98	0.06
	90th percentile	252.77	254.04	1.27
Cultures	Mean	202.61	202.61	0.00
	10th percentile	137.12	138.39	1.26
	25th percentile	174.15	173.34	-0.81
	50th percentile	208.15	207.19	-0.95
	75th percentile	236.21	235.97	-0.24
	90th percentile	257.93	259.28	1.35
Technology	Mean	204.48	204.48	0.00
	10th percentile	138.58	140.06	1.48
	25th percentile	176.64	175.83	-0.81
	50th percentile	210.55	210.00	-0.56
	75th percentile	237.64	237.69	0.05
	90th percentile	259.04	259.85	0.81
World role	Mean	204.22	204.22	0.00
	10th percentile	156.13	157.14	1.01
	25th percentile	182.26	181.13	-1.13
	50th percentile	207.04	206.35	-0.69
	75th percentile	229.10	228.88	-0.22
	90th percentile	246.62	247.93	1.30
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2001 U.S. History Assessment.

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