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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 4 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 4 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	218.98	218.98	#
	10th percentile	170.84	170.15	-0.69
	25th percentile	195.82	195.25	-0.57
	50th percentile	221.45	221.28	-0.17
	75th percentile	244.32	244.54	0.22
	90th percentile	263.24	263.97	0.73
Literary	Mean	221.80	221.80	#
	10th percentile	172.42	172.06	-0.36
	25th percentile	198.11	197.71	-0.40
	50th percentile	224.24	224.09	-0.15
	75th percentile	247.67	247.68	0.01
	90th percentile	267.26	267.71	0.45
Information	Mean	215.54	215.54	#
	10th percentile	165.73	165.27	-0.46
	25th percentile	191.17	190.71	-0.46
	50th percentile	217.76	217.60	-0.16
	75th percentile	241.83	241.97	0.14
	90th percentile	261.96	262.36	0.40

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