NAEP tdw - Comparison of Means and Percentiles of 2011 Scores and 2011 Transformed Provisional Scores, Grade 8 Mathematics Combined National and State Assessment, by Scale: 2013

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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 2011 Scores and 2011 Transformed Provisional Scores, Grade 8 Mathematics Combined National and State Assessment, by Scale: 2013

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.

NAEP Technical DocumentationComparison of means and percentiles of 2011 scores and 2011 transformed provisional scores, grade 8 mathematics combined national and state assessment, by scale: 2013
Scale	Statistics	Original 2011 estimate	2011-transformed provisional estimate	Difference between the provisional estimate and the original estimate
# Rounds to zero. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2013 Mathematics Assessment.
Composite scale	Mean	283.85	283.85	#
	10th percentile	236.88	235.02	-1.86
	25th percentile	260.08	258.93	-1.15
	50th percentile	284.92	284.80	-0.12
	75th percentile	308.84	309.79	0.95
	90th percentile	329.44	331.44	2.00
Number properties and operations	Mean	280.52	280.52	#
	10th percentile	233.98	233.49	-0.49
	25th percentile	257.09	256.61	-0.48
	50th percentile	281.81	281.51	-0.30
	75th percentile	305.22	305.40	0.18
	90th percentile	325.62	326.15	0.53
Measurement	Mean	279.64	279.64	#
	10th percentile	218.60	218.01	-0.59
	25th percentile	249.76	248.47	-1.29
	50th percentile	281.80	281.16	-0.64
	75th percentile	312.11	312.22	0.11
	90th percentile	337.89	339.00	1.11
Geometry	Mean	281.38	281.38	#
	10th percentile	236.67	236.34	-0.33
	25th percentile	259.11	258.25	-0.86
	50th percentile	282.58	282.00	-0.58
	75th percentile	305.02	305.14	0.12
	90th percentile	324.65	325.47	0.82
Data analysis, statistics, and probability	Mean	286.00	286.00	#
	10th percentile	231.49	230.79	-0.70
	25th percentile	259.18	258.20	-0.98
	50th percentile	287.82	287.39	-0.43
	75th percentile	315.02	315.37	0.35
	90th percentile	338.36	339.23	0.87
Algebra	Mean	288.75	288.75	#
	10th percentile	241.79	241.69	-0.10
	25th percentile	265.00	264.30	-0.70
	50th percentile	289.71	289.20	-0.51
	75th percentile	313.88	313.95	0.07
	90th percentile	334.86	335.36	0.50

Last updated 21 May 2017 (DC)

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