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 8 Geography National Assessment, by Scale: 2010

NAEP Technical DocumentationComparison means and percentiles of 2001 scores and 2001 transformed provisional scores, grade 8 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	260.22	260.22	#
	10th percentile	213.03	213.11	0.08
	25th percentile	238.06	237.94	-0.12
	50th percentile	263.82	263.72	-0.10
	75th percentile	285.25	285.36	0.11
	90th percentile	301.68	301.96	0.28
Space and place	Mean	260.29	260.29	#
	10th percentile	210.88	211.18	0.30
	25th percentile	237.18	236.85	-0.33
	50th percentile	263.85	263.72	-0.13
	75th percentile	286.34	286.41	0.07
	90th percentile	303.54	303.83	0.29
Environment and society	Mean	263.47	263.47	#
	10th percentile	214.28	213.86	-0.42
	25th percentile	240.74	240.41	-0.33
	50th percentile	267.10	267.01	-0.09
	75th percentile	289.61	289.69	0.08
	90th percentile	307.02	307.05	0.03
Spatial dynamics and connections	Mean	256.87	256.87	#
	10th percentile	210.85	211.12	0.27
	25th percentile	235.52	235.40	-0.12
	50th percentile	260.24	260.15	-0.09
	75th percentile	281.14	281.00	-0.14
	90th percentile	297.46	297.70	0.24

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