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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 2002 Scores and 2003 Transformed Provisional Scores in Reading at Grade 4, by Scale: 2003

Although the reading assessment comprises three contexts for reading: "Reading for Literary Experience," "Reading to Gain Information," and "Reading to Perform a Task," only the first two were assessed at grade 4 in 2003. 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 2002 scores and 2002 transformed provisional scores in reading at grade 4, by scale: 2003

Scale	Statistic	2002 scores	2002 transformed provisional scores	Difference between the 2002 provisional scores and the 2002 scores
Composite	Mean	218.58	218.58	#
	10th percentile	170.39	169.76	-0.63
	25th percentile	195.58	194.84	-0.74
	50th percentile	221.29	220.92	-0.37
	75th percentile	244.13	244.37	0.24
	90th percentile	262.58	263.60	1.02
Reading for literary experience	Mean	221.65	221.65	#
	10th percentile	173.59	173.35	-0.24
	25th percentile	199.04	198.43	-0.61
	50th percentile	224.50	224.05	-0.45
	75th percentile	246.86	246.96	0.10
	90th percentile	265.32	265.97	0.65
Reading to gain information	Mean	214.83	214.83	#
	10th percentile	163.05	162.80	-0.25
	25th percentile	189.54	189.03	-0.51
	50th percentile	217.22	216.77	-0.45
	75th percentile	242.48	242.46	-0.02
	90th percentile	262.92	263.51	0.59
# Rounds to zero. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2003 Reading Assessment.

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