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For those NAEP data users who have neither SAS, SPSS, nor STATA capabilities, yet require processing control information in a computer-readable format, the distribution files also contain machine-readable catalog files. Each machine-readable catalog record contains processing control information, item response (IRT) parameters, and response codes and labels. The machine-readable catalog files are described in and are available as part of the secondary-use data files package for use in analyzing the data with programming languages such as SAS, SPSS, and STATA. The following table illustrates the format of the machine-readable catalog file layout.
Start and end columns | Field width | Field type1 | Field description | Comments |
---|---|---|---|---|
1-4 | 4 | N | Field sequence number | |
5-12 | 8 | A | Field name | NAEP identification |
13-16 | 4 | N | Start column | |
17-20 | 4 | N | End column | |
21-22 | 2 | N | Field width | |
23-23 | 1 | N | Decimal places | |
24-24 | 1 | N | Field type | |
25-27 | 3 | N | Minimum valid response | |
28-30 | 3 | N | Maximum valid response | |
31-32 | 2 | N | Minimum correct response | |
33-34 | 2 | N | Maximum valid response | |
35-36 | 2 | N | Illegible code | |
37-38 | 2 | N | Off-task code | |
39-40 | 2 | N | Nonrateable response code | |
41-42 | 2 | N | I don't know (IDK) code | |
43-44 | 2 | N | Omit code | |
45-46 | 2 | N | Not reached code | |
47-48 | 2 | N | Multiple response code | |
49-98 | 2 | A | Name/description | |
99-106 | 2 | A | Alternate NAEP identification | |
107-107 | 1 | N | Reading classification: purpose | |
108-108 | 1 | N | Reading classification: stance | |
109-109 | 1 | N | Scaling category | |
110-191 | 82 | N | IRT parameters | |
192-193 | 2 | N | Number of data codes and labels | |
194-195 | 2 | A | Code value | 1st data code |
196-215 | 20 | A | Code value | |
216-217 | 2 | N | Code value | 2nd data code |
218-237 | 20 | A | Code label | |
- | ||||
1448-1449 | 2 | N | Code value | 58th data code |
1450-1469 | 2 | A | Code label | |
1A=alpha, N=numeric SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2000 Reading Assessment. |