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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 Accomodation-Permitted Sample Scores and 1998 Transformed Provisional Scores, Grade 12 Civics Assessment: 2006

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 means and percentiles of 1998 accommodation-permitted sample scores and 1998 transformed provisional scores, grade 12 civics assessment: 2006

Scale	Statistic	Original 1998 estimate	1998 transformed provisional estimate	Difference between the 1998 transformed provisional estimate and the 1998 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), 2006 Civics Assessment.
Civics scale	Mean	150.00	150.00	#
	10th percentile	102.99	103.08	0.10
	25th percentile	127.79	127.70	-0.09
	50th percentile	153.21	153.10	-0.11
	75th percentile	175.26	175.01	-0.24
	90th percentile	191.93	192.25	0.32

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