| Potential source of bias | Base-weighted respondent distribution | Final-weighted respondent distribution |
|---|---|---|
| Public | ||
| Minnesota, enrollment (200-500 students) | x | x |
| National, enrollment (1-100 students) | x | |
| National, locale (central city) | x | x |
| National, locale (rural) | x | |
| Nebraska, school level (secondary) | x | |
| State (California) | x | |
| Virginia, locale (suburban and rural) | x | |
| Private | ||
| Affiliation (Catholic – Diocesan) | x | |
| Affiliation (Catholic – Parochial) | x | |
| Affiliation (Nonsectarian – regular) | x | x |
| Baptist, enrollment (1-100 and 200-499 students) | x | |
| Baptist, school level (elementary and combined) | x | |
| Jewish, locale (central city) | x | x |
| Jewish, school level (elementary) | x | |
| Other religious, locale (suburban) | x | |
| NOTE: x denotes comparisons that are a potential source of bias. No potential bias was evident among the Bureau of Indian Education-funded schools due, to some extent, to small subpopulation cell sizes. | ||
| SOURCE: U.S. Department of Education, National Center for Education Statistics, Schools andStaffing Survey (SASS), "Public School Principal, BIE School Principal, and Private School PrincipalData Files," 2007–08. | ||
