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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Item Blocks as Defined After Scaling, Age 9 Reading Long-Term Trend Assessment: 2004

NAEP Technical DocumentationOverall descriptive statistics for item blocks as defined after scaling, age 9 reading long-term trend assessment: 2004

Statistic	Item type	Block R21	Block R22	Block R23	Block R24	Block R25	Block R26	Block R27	Block R28	Block R29	Block R30
Number of scaled items	Total	8	10	8	8	8	10	10	9	10	10
	Multiple choice	7	10	7	7	7	10	10	9	10	10
	Dichotomously scored constructed response	0	0	0	0	1	0	0	0	0	0
	Polytomously scored constructed response	1	0	1	1	0	0	0	0	0	0
Unweighted sample size	†	2,200	2,300	2,300	2,300	2,200	2,200	2,200	2,200	2,200	2,200
Weighted average item score	†	0.47	0.59	0.63	0.51	0.55	0.68	0.67	0.71	0.59	0.65
Weighted average polyserial	†	0.67	0.64	0.69	0.68	0.73	0.75	0.72	0.79	0.67	0.76
Weighted alpha reliability	†	0.63	0.66	0.65	0.68	0.72	0.73	0.75	0.73	0.70	0.78
Weighted proportion of students attempting last item1	†	0.86	0.97	0.92	0.91	0.89	0.96	0.96	0.97	0.96	0.97
† Not applicable. 1 The "Weighted proportion of students attempting last item" is equal to 1 - (Percent not responding to last item /100). NOTE: Item statistics in this table are described on the page Blocks of Items. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2004 Long-Term Trend Reading Assessment.

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