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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 12 U.S. history assessment: 2001

NAEP Technical DocumentationComparison means and percentiles of 1994 and 1994 transformed provisional scores, grade 12 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	286.09	286.09	0.00
	10th percentile	243.09	242.97	-0.12
	25th percentile	264.75	264.68	-0.06
	50th percentile	288.06	287.98	-0.08
	75th percentile	309.10	309.04	-0.07
	90th percentile	325.81	325.87	0.06
Democracy	Mean	285.75	285.75	0.00
	10th percentile	229.00	228.92	-0.08
	25th percentile	257.52	257.75	0.23
	50th percentile	287.91	287.74	-0.17
	75th percentile	315.82	315.87	0.05
	90th percentile	338.73	338.67	-0.06
Cultures	Mean	284.23	284.23	0.00
	10th percentile	248.94	249.43	0.49
	25th percentile	267.22	267.27	0.05
	50th percentile	286.19	286.00	-0.20
	75th percentile	302.69	302.71	0.02
	90th percentile	315.90	316.02	0.12
Technology	Mean	286.90	286.90	0.00
	10th percentile	248.31	248.45	0.14
	25th percentile	268.28	268.30	0.02
	50th percentile	289.04	289.01	-0.03
	75th percentile	307.27	307.24	-0.03
	90th percentile	321.86	321.98	0.13
World role	Mean	287.46	287.46	0.00
	10th percentile	240.13	240.39	0.26
	25th percentile	263.31	263.60	0.29
	50th percentile	288.97	288.81	-0.15
	75th percentile	313.10	313.17	0.07
	90th percentile	332.65	332.54	-0.11
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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