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 2006 Scores and 2006 Transformed Provisional Scores, Grade 8 Civics National Assessment, by Statistics: 2010

NAEP Technical DocumentationComparison means and percentiles of 2006 scores and 2006 transformed provisional scores, grade 8 civics national assessment, by statistics: 2010

Statistics	Original 2006 estimate	2006- transformed provisional estimate	Difference between the provisional estimate and the original estimate
# Rounds to zero. NOTE: A single overall scale was used for civics. 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. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2006 and 2010 Civics Assessments.
Mean	150.03	150.03	#
10th percentile	102.34	102.36	0.02
25th percentile	127.92	128.02	0.10
50th percentile	153.87	153.40	-0.47
75th percentile	175.03	175.03	#
90th percentile	191.24	191.90	0.66

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