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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Block-Level Descriptive Statistics as Defined After Scaling, Grade 8 Mathematics Combined National and State Assessment, by Block and School Type: 2022
NAEP Technical DocumentationBlock-Level Descriptive Statistics as Defined After Scaling, Grade 8 Mathematics Combined National and State Assessment, by Block and School Type: 2022
| Statistic | Block M1 | Block M2 | Block M3 | Block M4 | Block M5 | Block M6 | Block M7 | Block M8 | Block M9 | Block M10 | Block M11 | Block M12 | Block M13 | Block M14 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| The "Weighted average item score" of polytomous items is standardized to have a scale of 0 to 1 so they are comparable to dichotomously scored items. | ||||||||||||||
| The "Weighted proportion of students attempting last item" is equal to 1 – (Percent not responding to last item / 100). Weights are applied to reflect sampling design. | ||||||||||||||
| The nonpublic school sample includes only private schools, including Catholic schools. BIE and DoDEA schools are not included in either the public or nonpublic category. Item statistics in this table are described on the page Blocks of Items. | ||||||||||||||
| U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2022 Mathematics Assessment. | ||||||||||||||
| Number of scaled items | 15 | 15 | 15 | 19 | 20 | 20 | 21 | 14 | 17 | 20 | 15 | 16 | 18 | 16 |
| Public school | ||||||||||||||
| Unweighted sample size | 14,800 | 14,800 | 14,900 | 15,000 | 14,900 | 14,900 | 14,800 | 16,000 | 16,600 | 16,700 | 14,800 | 14,800 | 16,100 | 16,100 |
| Weighted average item score | .54 | .39 | .52 | .36 | .43 | .43 | .48 | .30 | .38 | .49 | .56 | .51 | .44 | .48 |
| Weighted average R biserial/polyserial | .66 | .66 | .63 | .62 | .59 | .56 | .60 | .71 | .68 | .63 | .63 | .68 | .68 | .65 |
| Weighted alpha reliability | .76 | .80 | .77 | .83 | .81 | .78 | .82 | .78 | .82 | .85 | .75 | .80 | .83 | .79 |
| Weighted proportion of students attempting last item | .92 | .81 | .96 | .82 | .88 | .79 | .90 | .87 | .84 | .84 | .95 | .95 | .85 | .94 |
| Nonpublic school | ||||||||||||||
| Unweighted sample size | 200 | 200 | 200 | 200 | 200 | 200 | 200 | 200 | 200 | 200 | 200 | 200 | 200 | 200 |
| Weighted average item score | .59 | .43 | .59 | .47 | .48 | .49 | .54 | .34 | .46 | .58 | .62 | .57 | .52 | .53 |
| Weighted average R biserial/polyserial | .64 | .64 | .54 | .59 | .59 | .50 | .58 | .68 | .67 | .60 | .59 | .65 | .65 | .57 |
| Weighted alpha reliability | .72 | .79 | .66 | .80 | .81 | .72 | .80 | .76 | .79 | .83 | .66 | .75 | .80 | .71 |
| Weighted proportion of students attempting last item | .97 | .85 | 1.00 | .91 | .89 | .81 | .93 | .94 | .86 | .88 | .97 | .98 | .91 | .96 |
Last updated 24 July 2024 (SK)