Another new feature in the 2003 state assessment was the introduction of a national sample of charter schools for fourth grade. Several states in the assessment were targeted for an oversampling of charter schools, supplementing information for charter schools that came into the state assessment sample.
The requirement for a national sample of charter schools in fourth grade affected the state samples in three states: California, Michigan, and Texas. In these three states, the student sample size targets for charter schools are shown in the table below. In addition, the sampling rates for charter schools in these three states were adjusted to meet these targets. The sampling proportionality constants associated with these adjusted sampling rates are also shown in the table.
|State||Target sample size||Sampling proportionality constant|
|SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2003.|
As with the Trial Urban District Assessment (TUDA) districts, because of the overlap with the State NAEP jurisdiction samples, the school sample sizes in these states are somewhat higher than if there had been no special charter school study. In some states there were distinct sampling rates for the following schools:
For any school that belonged to more than one of these groups (e.g., fourth-grade charter schools in San Diego, California) for which different sampling rates were set, the school was sampled at the highest applicable rate.