NAEP Technical DocumentationFinal Weight Files

The final weight files contain a variable AN_TYPE, representing the analysis type. AN_TYPE was created by

AN_TYPE

= 1, if the student was non-SD/LEP;

= 2, if the student was SD/LEP;

= 3, if the student was SD/LEP and the school was assigned sample type 2; or

= 4, if the student was SD/LEP and the school was assigned sample type 3.

Values of 3 and 4 of AN_TYPE comprise all SD/LEP students, which is equal to value 2 of AN_TYPE. To construct the sample for the R2 population, the corresponding sample can be identified as AN_TYPE of values 1 or 3. For the R3 population, the corresponding sample can be identified as AN_TYPE of values 1 or 4.

The tables below show the distribution of the final student weights FSTUWGT among the 2000 state assessment’s participating jurisdictions by grade (fourth and eighth), assessment subject (mathematics and science), and reporting population (non-accommodated and accommodated). Reporting populations differ by whether accommodations were offered to disabled or limited English proficiency (SD/LEP) students. The non-accommodated reporting population, also known as the R2 reporting population, includes all non SD/LEP students plus SD/LEP students from non-accommodated sessions. The accommodated reporting population, also known as the R3 reporting population, includes all non SD/LEP students plus SD/LEP students from accommodated sessions.

Special note on Virgin Islands, Grade 8. The Virgin Islands (VI) grade 8 sample required a special weighting process to handle a problem discovered in the VI grade 8 samples. The sampling problem created a large imbalance between sample types 2 and 3 for SD/LEP students, which made raking for SD/LEP students by sample type impossible. To resolve the sampling problem, the VI Grade 8 sample was considered one sample type equal to 2. Therefore, the raking process was skipped. Analysis type 2 records were duplicated to create analysis type 3, which is redundant but needed to facilitate data analysis by Educational Testing Service without changing their system. Therefore, only the R2 population applies to VI grade 8.

Distribution of the final student weights (FSTUWGT)

Grade 4 Mathematics (Accommodations Not Permitted [R2])
Grade 4 Mathematics (Accommodations Permitted [R3])

Grade 8 Mathematics (Accommodations Not Permitted [R2])
Grade 8 Mathematics (Accommodations Permitted [R3])

Grade 4 Science (Accommodations Not Permitted [R2])
Grade 4 Science (Accommodations Permitted [R3])

Grade 8 Science (Accommodations Not Permitted [R2])
Grade 8 Science (Accommodations Permitted [R3])

Last updated 08 March 2008 (DR)

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