NAEP tdw - Comparison of Means and Percentiles of 2011 Scores and 2011 Transformed Provisional Scores, Grade 8 Reading Combined National and State Assessment, by Scale: 2013

Table of Contents | Search Technical Documentation | References

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 2011 Scores and 2011 Transformed Provisional Scores, Grade 8 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 2011 scores and 2011 transformed provisional scores, grade 8 reading combined national and state assessment, by scale: 2013
Scale	Statistics	Original 2011 estimate	2011-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	265.20	265.20	#
	10th percentile	220.71	219.59	-1.12
	25th percentile	244.12	243.34	-0.78
	50th percentile	267.19	267.09	-0.10
	75th percentile	288.78	289.32	0.54
	90th percentile	307.09	308.10	1.01
Literary	Mean	263.19	263.19	#
	10th percentile	216.01	215.56	-0.45
	25th percentile	240.68	240.27	-0.41
	50th percentile	265.21	265.07	-0.14
	75th percentile	288.13	288.42	0.29
	90th percentile	307.82	308.25	0.43
Information	Mean	266.84	266.84	#
	10th percentile	221.69	221.30	-0.39
	25th percentile	245.43	244.96	-0.47
	50th percentile	268.85	268.65	-0.20
	75th percentile	290.75	290.91	0.16
	90th percentile	309.36	309.86	0.50

Last updated 21 May 2017 (DC)

Printer-friendly Version