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 2001 Scores and 2001 Transformed Provisional Scores, Grade 12 Geography National Assessment, by Scale: 2010

NAEP Technical DocumentationComparison means and percentiles of 2001 scores and 2001 transformed provisional scores, grade 12 geography national assessment, by scale: 2010

Scale	Statistics	Original 2001 estimate	2001- transformed provisional estimate	Difference between the provisional estimate and the original estimate
# Rounds to zero. NOTE: 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), 2001 and 2010 Geography Assessments.
Composite scale	Mean	284.06	284.06	#
	10th percentile	246.01	245.96	-0.05
	25th percentile	265.92	265.80	-0.12
	50th percentile	286.42	286.22	-0.20
	75th percentile	304.27	304.18	-0.09
	90th percentile	318.53	318.99	0.46
Space and place	Mean	283.43	283.43	#
	10th percentile	240.09	240.35	0.26
	25th percentile	263.02	263.06	0.04
	50th percentile	286.23	285.87	-0.36
	75th percentile	306.21	306.23	0.02
	90th percentile	322.04	322.75	0.71
Environment and society	Mean	280.21	280.21	#
	10th percentile	246.00	246.00	#
	25th percentile	264.00	264.18	0.18
	50th percentile	282.55	282.33	-0.22
	75th percentile	298.28	298.15	-0.13
	90th percentile	310.95	311.18	0.23
Spatial dynamics and connections	Mean	288.75	288.75	#
	10th percentile	251.01	251.31	0.30
	25th percentile	270.27	270.03	-0.24
	50th percentile	290.65	290.11	-0.54
	75th percentile	308.94	308.92	-0.02
	90th percentile	323.90	324.13	0.23

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