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HomeTDWNAEP Sample DesignNAEP 2004 Long-Term Trend Sample DesignSampling of Schools and StudentsLong-Term Trend School Sample SelectionLong-Term Trend Targeted Number of Students by Age

NAEP Technical DocumentationLong-Term Trend Targeted Number of Students by Age

The school measures of size for each of the long-term trend school samples were set to be proportional to the number of estimated age-eligible students, divided by the PSU probability of selection. The overall sample sizes were driven by the targeted number of students for each assessment session. These targets are presented in this section. The 2004 long-term trend sessions consisted of:

• 'B' session: new mathematics, new reading, mathematics pilot, and reading pilot,
• 'C', 'D' sessions: mathematics bridge (two different components), and
• 'F' session: reading bridge.

The 'new' sessions use the newly developed instruments for 2004 (the 'main' study). The target numbers of assessments for each session for the age 9 sample, the age 13 sample, and the age 17 sample are given in the following tables.

School measure of size targets for 9-year-old students, long-term trend assessment: By type of school and session, 2004

Session	Public school students	Private school students	Total students
Total	23,400	5,850	29,250
Session B	14,600	3,650	18,250
Session C	2,400	600	3,000
Session D	2,400	600	3,000
Session F	4,000	1,000	5,000
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 Assessment.

School measure of size targets for 13-year-old students, long-term trend assessment: By type of school and session, 2004

	Public school students	Private school students	Total students
Total	23,400	5,850	29,250
Session B	14,600	3,650	18,250
Session C	2,400	600	3,000
Session D	2,400	600	3,000
Session F	4,000	1,000	5,000
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 Assessment.

School measure of size targets for 17-year-old students, long-term trend assessment: By type of school and session, 2004

	Public school students	Private school students	Total students
Total	21,800	5,450	27,250
Session B	14,600	3,650	18,250
Session C	3,200	800	4,000
Session F	4,000	1,000	5,000
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 Assessment.

These targets represent completed assessments. To get the overall sample sizes, these targets were adjusted upwards to allow for losses from absent, refusing, and/or ineligible schools and students (so that the completed assessment targets would be as desired). The expected student response rates were set to be the realized weighted student response rates for the NAEP 2001 geography and U.S. history assessments, as this was the most recent experience. The average of the NAEP 2001 history exclusion rate and geography exclusion rate was used as the exclusion rate, from the 'R3' reporting population (i.e., including only students under the new accommodations system). The tables below present overall revised targets by school type for 9-, 13-, and 17-year-olds respectively.

Student sample size targets for 9-year-old students in responding schools adjusted for expected  losses, long-term trend assessment: By school type, 2004

	Assessed students	Expected student response rate (percent)	Eligible student target	Expected student eligibility rate (percent)	Student target in cooperative schools	Expected school response rate (percent)	Total student target in cooperating schools
Total	29,300	†	30,600	†	31,800	†	37,700
Public	23,400	95.1	24,600	96.0	25,600	85.0	30,200
Private	5,900	96.8	6,000	98.7	6,100	80.9	7,600
† Not applicable. 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 Assessment.

Student sample size targets for 13-year-old students in responding schools adjusted for expected losses, long-term trend assessment: By school type, 2004

	Assessed students	Expected student response rate (percent)	Eligible student target	Expected student eligibility rate (percent)	Student target in cooperative schools	Expected school response rate (percent)	Total student target in cooperating schools
Total	29,300	†	31,600	†	32,700	†	39,700
Public	23,400	91.8	25,500	96.1	26,500	83.8	31,700
Private	5,900	95.9	6,100	99.8	6,100	76.1	8,000
† Not applicable. 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 Assessment.

Student sample size targets for 17-year-old students in responding schools adjusted for expected losses, long-term trend assessment: By school type, 2004

	Assessed students	Expected student response rate (percent)	Eligible student target	Expected student eligibility rate (percent)	Student target in cooperative schools	Expected school response rate (percent)	Total student target in cooperating schools
Total	27,300	†	35,300	†	36,000	†	49,600
Public	21,800	74.5	29,300	97.4	30,000	76.4	39,300
Private	5,500	90.6	6,000	100.0	6,000	58.9	10,200
† Not applicable. 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 Assessment.

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