NAEP Technical DocumentationComparison of Means and Percentiles of 2013 Scores and 2013-Transformed Provisional Scores, Grade 12 Reading National Assessment, by Scale: 2015

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. Prior to transformation, provisional estimates 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.

Comparison of means and percentiles of 2013 scores and 2013-transformed provisional scores, grade 12 reading national assessment, by scale: 2015

Scale	Statistic	Original 2013 estimate	2013-transformed provisional estimate	Difference between the provisional estimate and the original estimate
Composite scale	Mean	288.43	288.43	#
	10th percentile	238.68	238.42	-0.25
	25th percentile	264.46	264.12	-0.35
	50th percentile	290.50	290.32	-0.18
	75th percentile	314.65	314.79	0.14
	90th percentile	335.27	335.75	0.48
Literary	Mean	280.12	280.12	#
	10th percentile	217.94	217.79	-0.15
	25th percentile	250.56	250.10	-0.47
	50th percentile	282.94	282.60	-0.34
	75th percentile	312.82	312.90	0.08
	90th percentile	338.45	339.04	0.59
Information	Mean	291.99	291.99	#
	10th percentile	246.13	246.10	-0.03
	25th percentile	269.64	269.42	-0.22
	50th percentile	293.71	293.59	-0.12
	75th percentile	316.25	316.32	0.07
	90th percentile	335.47	335.68	0.20
# Rounds to zero. NOTE: The grade 12 reading assessment was administered at the state level in 2013, but not in 2015. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2015 Reading Assessment.

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