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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 2002 Scores and 2002 Transformed Provisional Scores, Grade 12 Reading National 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 2002 scores and 2002 transformed provisional scores, grade 12 reading national main assessment, by scale: 2005

Scale	Statistic	Original 2002 score	2002 transformed provisional score	Difference between the provisional score and the original score
Composite Scale	Mean	286.86	286.86	#
	10th Percentile	237.45	237.47	-0.02
	25th Percentile	263.30	263.35	-0.05
	50th Percentile	289.13	289.17	-0.04
	75th Percentile	312.49	312.73	-0.24
	90th Percentile	332.49	332.59	-0.10
Reading for literary experience	Mean	280.69	280.69	#
	10th Percentile	218.15	218.00	0.15
	25th Percentile	250.03	249.81	0.22
	50th Percentile	282.93	283.15	-0.22
	75th Percentile	313.65	313.36	0.29
	90th Percentile	339.27	339.36	-0.09
Reading to gain information	Mean	290.76	290.76	#
	10th Percentile	246.48	246.37	0.11
	25th Percentile	269.45	269.69	-0.24
	50th Percentile	292.70	292.69	0.01
	75th Percentile	313.87	313.90	-0.03
	90th Percentile	332.08	332.12	-0.04
Reading to perform a task	Mean	288.91	288.91	#
	10th Percentile	235.71	235.76	-0.05
	25th Percentile	263.07	263.20	-0.13
	50th Percentile	290.85	290.97	-0.12
	75th Percentile	316.65	316.87	-0.22
	90th Percentile	339.22	338.97	0.25
# 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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