NAEP Analysis and Scaling → Initial Activities → Constructed-Response Interrater Reliability → Range of Response Codes, Percent Agreement, and Cohen's Kappa or Intraclass Correlation for the Constructed-Response Items Used in Scaling, Age 9 Reading Long-Term Trend Assessment, by Item and Block: 2008

NAEP Technical DocumentationRange of response codes, percent agreement, and Cohen's Kappa or intraclass correlation for the constructed-response items used in scaling, age 9 reading long-term trend assessment, by item and block: 2008

Block	Item	Range of response codes	Sample size	Percent agreement	Cohen’s Kappa	Intraclass correlation
— Note available. The intraclass correlation is not reported for dichotomously scored items; Cohen's Kappa is not reported for polytomously scored items. NOTE: Cohen's Kappa is a measure of reliability that is appropriate for items that are dichotomously scored. The intraclass correlation coefficient is most appropriate for items with more than two categories. 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), 2008 Reading Long-Term Trend Assessment.
R21	N021203	1–5	600	80	—	0.80
R23	N021803	1–4	600	95	—	0.95
R24	N022103	1–4	600	86	—	0.86
R25	N022405	1–4	600	87	—	0.87

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