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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 Means and Percentiles of Original 2003 Scores and 2003 Transformed Provisional Scores, Grade 8 Reading Combined National and State Main Assessment, by Scale: 2005

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 means and percentiles of original 2003 scores and 2003 transformed provisional scores, grade 8 reading combined national and state main assessment, by scale: 2005

Scale	Statistic	Original 2003 score	2003 transformed provisional score	Difference between the provisional score and the original score
Composite Scale	Mean	263.30	263.30	#
	10th Percentile	217.07	215.41	1.66
	25th Percentile	241.64	240.63	1.01
	50th Percentile	265.92	265.61	0.31
	75th Percentile	287.74	288.47	-0.73
	90th Percentile	306.02	307.68	-1.66
Reading for literary experience	Mean	262.06	262.06	#
	10th Percentile	213.50	212.94	0.56
	25th Percentile	239.03	238.06	0.97
	50th Percentile	264.41	263.98	0.43
	75th Percentile	287.66	287.86	-0.20
	90th Percentile	307.49	308.36	-0.87
Reading to gain information	Mean	264.44	264.44	#
	10th Percentile	217.16	216.48	0.68
	25th Percentile	242.19	241.64	0.55
	50th Percentile	266.92	266.51	0.41
	75th Percentile	289.40	289.66	-0.26
	90th Percentile	308.53	309.19	-0.66
Reading to perform a task	Mean	263.51	263.51	#
	10th Percentile	208.75	208.14	0.61
	25th Percentile	238.42	237.46	0.96
	50th Percentile	266.85	266.39	0.46
	75th Percentile	292.43	292.66	-0.23
	90th Percentile	313.81	314.66	-0.85
# Rounds to zero. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2005 Reading Assessment.

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