NAEP Assessment Sample Design → NAEP 2012 Sample Design → 2012 Economics Assessment Sample Design → 2012 Private School Economics Assessment → Substitute Private Schools for the 2012 Economics Assessment

NAEP Technical DocumentationSubstitute Private Schools for the 2012 Economics Assessment

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 embedded within the sampled primary sampling unit (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. Since 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 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 economics private school sample or assigned as a substitute for another twelfth-grade private school (earlier in the sort ordering). 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) 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 95 original sampled private schools, 20 schools had substitutes activated when the original eligible schools did not participate. Ultimately, 5 of the activated substitute private schools participated in the economics assessment.

Printer-friendly Version