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NAEP Assessment Sample Design → NAEP 2006 Sample Design → 2006 Public School Sample → Student Sample Selection Within Public Schools for the 2006 Assessment

NAEP Technical DocumentationStudent Sample Selection Within Public Schools for the 2006 Assessment

For fourth grade, the student sample consisted of all grade-eligible students in the school if the school had 150 or fewer students, or a sample of 123 students selected without replacement if the school had 151 or more students. For eighth and twelfth grades, the student sample consisted of all grade-eligible students in the school if the school had 143 or fewer students, or a sample of 95 students selected without replacement if the school had 144 or more students.

The assessments were partitioned into two basic spirals: history (the "history session") and other (the "other session"). For fourth grade, the other spiral included civics, math precalibration, and reading precalibration. For eighth grade, the other spiral included civics, math precalibration, reading precalibration, and a writing pilot. For twelfth grade, the other spiral included civics, economics, and a writing pilot.

The probability of being assigned to a history or an other session varied by grade. These probabilities are shown in the table below. The student sampling process was designed so each student would have exactly these probabilities of being assigned to each of the sessions. 

Student session assignment probabilities, by grade and session type: 2006

Grade	Session	Selection probability	Percentage
NOTE: Other = sessions other than history. For fourth grade, "other" included civics, math precalibration, and reading precalibration. For eighth grade, "other" included civics, math precalibration,  reading precalibration, and a writing pilot. For twelfth grade, "other" included civics, economics, and a writing pilot. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2006.
4	History	6/23	26.09
	Other	17/23	73.91
8 & 12	History	1/3	33.33
	Other	2/3	66.67

The process of list submission, sampling students from year-round schools, sampling new enrollees, and determining student eligibility and exclusion status was the same as the process used for the NAEP 2005 State student sample. 

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