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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 4 Reading Combined National and State Main Assessment, by Scale: 2005

The "Reading to perform a task" assessment is not used at the grade 4 level. 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 4 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	218.25	218.25	#
	10th Percentile	168.65	167.94	0.71
	25th Percentile	194.67	194.01	0.66
	50th Percentile	220.98	220.65	0.33
	75th Percentile	244.42	244.56	-0.14
	90th Percentile	263.56	264.45	-0.89
Reading for literary experience	Mean	221.43	221.43	#
	10th Percentile	171.11	170.84	0.27
	25th Percentile	197.84	197.27	0.57
	50th Percentile	224.30	223.89	0.41
	75th Percentile	247.85	247.87	-0.02
	90th Percentile	267.18	267.87	-0.69
Reading to gain information	Mean	214.35	214.35	#
	10th Percentile	162.27	162.00	0.27
	25th Percentile	188.91	188.55	0.36
	50th Percentile	216.76	216.42	0.34
	75th Percentile	241.97	241.96	0.01
	90th Percentile	262.85	263.29	-0.44
# 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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