NAEP Technical DocumentationComparison of Means and Percentiles of 2013 Scores and 2013-Transformed Provisional Scores, Grade 4 Reading Combined National and State 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. 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.

Comparison of means and percentiles of 2013 scores and 2013-transformed provisional scores, grade 4 reading combined national and state 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	221.83	221.83	#
	10th percentile	173.53	172.20	-1.32
	25th percentile	200.24	199.30	-0.93
	50th percentile	225.39	225.33	-0.06
	75th percentile	247.18	247.72	0.54
	90th percentile	265.33	266.43	1.10
Literary	Mean	223.78	223.78	#
	10th percentile	174.30	173.64	-0.65
	25th percentile	201.53	200.88	-0.65
	50th percentile	227.20	227.11	-0.09
	75th percentile	249.73	249.99	0.26
	90th percentile	268.68	269.10	0.43
Information	Mean	219.89	219.89	#
	10th percentile	170.25	169.70	-0.55
	25th percentile	197.49	196.95	-0.54
	50th percentile	223.51	223.36	-0.15
	75th percentile	245.98	246.12	0.14
	90th percentile	264.75	265.14	0.39
# Rounds to zero. 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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