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NAEP Analysis and Scaling → Scale Linking and Transformation to the Reporting Metric → The Transformation Equation → Comparisons of Distributions of Linking Samples for NAEP Assessments → Comparison Means and Percentiles of 1994 and Provisional 1994 Transformed Scores, Grade 8 Geography Assessment: 2001

NAEP Technical DocumentationComparison means and percentiles of 1994 and provisional 1994 transformed scores, grade 8 geography assessment: 2001

Scale	Statistic	Original 1994 estimate	Provisional 1994	Difference between the provisional estimate and the original estimate
Composite	Mean	259.70	259.70	0.00
	10th percentile	212.63	211.85	-0.77
	25th percentile	237.19	236.91	-0.28
	50th percentile	262.73	262.85	0.12
	75th percentile	284.49	284.87	0.38
	90th percentile	302.49	302.96	0.47
Space and place	Mean	258.71	258.71	0.00
	10th percentile	208.56	208.11	-0.45
	25th percentile	233.90	233.97	0.08
	50th percentile	261.70	261.83	0.13
	75th percentile	285.15	285.18	0.03
	90th percentile	304.80	304.97	0.17
Environment and society	Mean	263.26	263.26	0.00
	10th percentile	217.65	217.89	0.25
	25th percentile	241.71	241.16	-0.54
	50th percentile	266.32	266.15	-0.16
	75th percentile	287.25	287.53	0.27
	90th percentile	304.22	304.39	0.17
Spatial dynamics and connections	Mean	257.45	257.45	0.00
	10th percentile	210.54	208.75	-1.79
	25th percentile	234.88	234.27	-0.61
	50th percentile	260.54	260.42	-0.12
	75th percentile	282.25	283.17	0.93
	90th percentile	300.23	301.32	1.09
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2001 Geography Assessment.

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