NAEP tdw - Comparison of Means and Percentiles of 2009 Scores and 2009 Transformed Provisional Scores, Grade 12 Reading Combined National and State Assessment, by Scale: 2013

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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 2009 Scores and 2009 Transformed Provisional Scores, Grade 12 Reading Combined National and State Assessment, by Scale: 2013

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 2009 scores and 2009 transformed provisional scores, grade 12 reading combined national and state assessment, by scale: 2013
Scale	Statistics	Original 2009 estimate	2009-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), 2013 Reading Assessment.
Composite scale	Mean	288.27	288.27	#
	10th percentile	238.00	237.62	-0.38
	25th percentile	263.97	263.70	-0.27
	50th percentile	290.65	290.54	-0.11
	75th percentile	314.80	314.96	0.16
	90th percentile	335.32	335.77	0.45
Literary	Mean	281.13	281.13	#
	10th percentile	216.57	216.42	-0.15
	25th percentile	249.77	249.46	-0.31
	50th percentile	284.11	283.99	-0.12
	75th percentile	315.08	315.18	0.10
	90th percentile	341.13	341.44	0.31
Information	Mean	291.33	291.33	#
	10th percentile	244.67	244.54	-0.13
	25th percentile	268.78	268.66	-0.12
	50th percentile	293.47	293.45	-0.02
	75th percentile	316.03	316.01	-0.02
	90th percentile	335.29	335.39	0.10

Last updated 21 May 2017 (DC)

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