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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 of Means and Percentiles of 2005 Scores and 2005 Transformed Provisional Scores, Grade 8 Reading Combined National and State Main Assessment, by Scale: 2007

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 of means and percentiles of 2005 scores and 2005 transformed provisional scores, grade 8 reading combined national and state main assessment, by scale: 2007

Scale	Statistic	Original 2005 estimate	2005 transformed provisional estimate	Difference between the provisional estimate and 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), 2007 Reading Assessment.
Composite scale	Mean	262.17	262.17	#
	10th percentile	215.80	214.58	-1.22
	25th percentile	240.18	239.45	-0.73
	50th percentile	264.50	264.38	-0.12
	75th percentile	286.49	287.09	0.60
	90th percentile	305.19	306.29	1.10
Literary	Mean	261.25	261.25	#
	10th percentile	212.78	212.39	-0.39
	25th percentile	237.73	237.30	-0.43
	50th percentile	263.47	263.12	-0.35
	75th percentile	286.70	286.97	0.27
	90th percentile	306.67	307.23	0.56
Information	Mean	263.20	263.20	#
	10th percentile	216.09	215.58	-0.51
	25th percentile	240.80	240.33	-0.47
	50th percentile	265.30	265.26	-0.04
	75th percentile	287.99	288.11	0.12
	90th percentile	307.40	307.66	0.26
Task	Mean	261.95	261.95	#
	10th percentile	207.47	207.10	-0.37
	25th percentile	236.28	235.61	-0.67
	50th percentile	264.65	264.41	-0.24
	75th percentile	290.47	290.80	0.33
	90th percentile	312.70	313.17	0.47

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