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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 Means and Percentiles of 1998 Scores and 2002 Transformed Provisional Scores in Reading at Grade 12, by Scale: 2002

The 2002 equating estimates were based on the 2002 equating sample, which were placed on the reporting metric through transformation identified by linking the 1998 provisional estimates to the original estimates.The 2002 operational transformed provisional estimates were obtained through a process of scaling and transformation described below. First, the scaling results for the 2002 operational sample were used to obtain the provisional estimates. Second, through common population linking of the results for the equating sample and the operational sample, transformation constants were identified and applied to the operational sample results, resulting in the operational transformed provisional estimates shown in the table. If the transformation was done correctly, the equating and operational transformed provisional estimates should have the same mean within each scale.

NAEP Technical DocumentationComparison means and percentiles of 1998 scores and 2002 transformed provisional scores in reading at grade 12, by scale: 2002

Scale	Statistic	1998 scores	2002 transformed provisional scores	Difference between the 2002 provisional and the 1998 scores
Composite	Mean	286.86	286.86	#
	10th percentile	237.09	237.46	0.37
	25th percentile	262.78	263.30	0.52
	50th percentile	289.16	289.14	-0.02
	75th percentile	313.09	312.49	-0.60
	90th percentile	333.08	332.50	-0.58
Reading for literary experience	Mean	280.68	280.68	#
	10th percentile	217.96	218.16	0.20
	25th percentile	250.19	250.04	-0.15
	50th percentile	282.98	282.93	-0.05
	75th percentile	313.25	313.66	0.41
	90th percentile	339.89	339.27	-0.62
Reading to gain information	Mean	290.76	290.76	#
	10th percentile	246.46	246.48	0.02
	25th percentile	269.32	269.46	0.14
	50th percentile	292.76	292.70	-0.06
	75th percentile	313.91	313.88	-0.03
	90th percentile	332.22	332.09	-0.13
Reading to perform a task	Mean	288.91	288.91	#
	10th percentile	235.76	235.72	-0.04
	25th percentile	263.18	263.07	-0.11
	50th percentile	291.19	290.85	-0.34
	75th percentile	317.15	316.65	-0.50
	90th percentile	338.99	339.22	0.23
# Rounds to zero. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2002 Reading Assessment.

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