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NAEP Technical DocumentationSubstitute Private Schools for the 2008 Arts Assessment
To the extent possible, substitutes were preselected for the private school samples by sorting the school frame file according to the actual order used in the sampling process (the implicit stratification). For operational reasons, the original selection order was imbedded within the sampled PSU and state. Each sampled school had each of its nearest neighbors within the same sampling stratum on the school frame file identified as a potential substitute. When grade enrollment was used as the last sort ordering variable the nearest neighbors had grade enrollment values very close to that of the sampled school. This was done in order to facilitate the selection of about the same number of students within the substitute as would have been selected from the original sampled school.
Schools were disqualified as potential substitutes if they were already selected in the original arts private school sample or assigned as a substitute for another eighth-grade private school (earlier in the sort ordering). In addition, private schools were disqualified as potential substitutes if they were already selected in the original long-term trend (LTT) sample for any age (9, 13, or 17), field test, or science interactive computer testing (ICT), or already assigned as a LTT substitute school.
If both nearest neighbors were still eligible to be substitutes, the one with a closer grade enrollment was chosen. If both nearest neighbors were equally distant from the sampled school in their grade enrollment (an uncommon occurrence), one of the two was randomly selected.
Of the approximately 60 originally sampled private schools, all but about 10 were not assigned a substitute. However, less than five substitute private schools participated in the arts assessment.
Last updated 05 March 2010 (JL)
