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 4 Geography National Assessment, by Scale: 2010

NAEP Technical DocumentationComparison of means and percentiles of 2001 scores and 2001 transformed provisional scores, grade 4 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	208.26	208.26	#
	10th percentile	158.55	157.75	-0.80
	25th percentile	184.45	184.25	-0.20
	50th percentile	210.91	211.27	0.36
	75th percentile	235.15	235.32	0.17
	90th percentile	253.77	253.97	0.20
Space and place	Mean	210.49	210.49	#
	10th percentile	161.55	160.20	-1.35
	25th percentile	186.19	186.51	0.32
	50th percentile	212.73	213.24	0.51
	75th percentile	237.20	237.31	0.11
	90th percentile	256.54	255.98	-0.56
Environment and society	Mean	205.16	205.16	#
	10th percentile	148.51	147.98	-0.53
	25th percentile	178.45	177.73	-0.72
	50th percentile	208.32	208.55	0.23
	75th percentile	235.41	235.64	0.23
	90th percentile	257.06	257.37	0.31
Spatial dynamics and connections	Mean	208.40	208.40	#
	10th percentile	160.32	159.63	-0.69
	25th percentile	185.35	185.01	-0.34
	50th percentile	211.06	211.03	-0.03
	75th percentile	234.33	234.47	0.14
	90th percentile	252.79	252.86	-0.07

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