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The following table gives the final sampling parameter1 bj for the 2002 national main assessments' private school strata. The methodology for computing bj from the targets Tj for each stratum (as given in Target Fourth-Grade Private School Sample Sizes, Target Eighth-Grade Private School Sample Sizes, Target Twelfth-Grade Private School Sample Sizes) is discussed in Computation of School Measures of Size.
Private school stratum | Fourth-grade bj value |
Eighth-grade bj value |
Twelfth-grade bj value |
---|---|---|---|
Catholic schools | 0.000782 | 0.000963 | 0.001157 |
Lutheran schools | 0.001758 | 0.002437 | 0.006637 |
Conservative Christian schools | 0.001019 | 0.001422 | 0.001692 |
Other private schools | 0.001198 | 0.001341 | 0.001140 |
Affiliation unknown schools | 0.000286 | 0.000286 | 0.000286 |
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2002. |
1The sampling parameter can be viewed as the marginal increase in the probability of selection of a school for each extra enrolled student, up to the maximum student sample size for the school. A value of .001 for this sampling parameter means that all other things being equal an increase of 10 enrolled students (without exceeding the cutoff) increases the probability of selection for the school by 0.01. The subscript j indicates private school stratum.