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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 1998 scores and 1998 transformed provisional scores, grade 4 reading assessment: 2000

NAEP Technical DocumentationComparison means and percentiles of 1998 scores and 1998 transformed provisional scores, grade 4 reading assessment: 2000

Scale	Statistic	Original 1998 estimate	1998 transformed provisional estimate	Difference between the provisional estimate and the original estimate
Composite	Mean	217.32	217.32	0.00
	10th percentile	167.00	167.53	0.53
	25th percentile	193.44	192.97	-0.47
	50th percentile	220.15	219.77	-0.39
	75th percentile	244.08	244.12	0.04
	90th percentile	262.95	263.69	0.74
Reading for literary experience	Mean	219.64	219.64	0.00
	10th percentile	168.36	167.70	-0.66
	25th percentile	194.99	194.77	-0.22
	50th percentile	222.51	222.01	-0.50
	75th percentile	247.12	247.24	0.12
	90th percentile	267.03	267.49	0.46
Reading to gain information	Mean	214.48	214.48	0.00
	10th percentile	162.50	162.66	0.16
	25th percentile	189.55	188.67	-0.88
	50th percentile	216.95	216.85	-0.09
	75th percentile	242.23	242.36	0.13
	90th percentile	262.78	263.15	0.37
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2000 Reading Assessment.

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