Nonresponse adjustments were designed to reduce or eliminate nonresponse bias. The following variables were included in the nonresponse adjustments: urbanicity, enrollment, and state. The final-weighted comparison to the frame reflects the nonresponse adjustment. Table B-2 shows those comparisons that have evidence of potential bias after the nonresponse adjustments were included. For further information on unit response rates and nonresponse bias analysis, see the Documentation for the 2007-08 Schools and Staffing Survey (Tourkin et al. forthcoming).
Percent of items with a response rate of 85 percent or
Percent of items with a response rate of less than
Survey Public School Teacher Listing Form BIE School Teacher Listing Form Private School Teacher Listing Form
more † † †
85 percent † † †
Public School District
Public School BIE School Private School
95.2 85.8 88.3
4.8 14.2 11.7
Public School Principal BIE School Principal Private School Principal
99.4 98.2 98.0
0.6 1.8 2.0
Public School Teacher BIE School Teacher Private School Teacher
91.4 86.8 90.0
8.6 13.2 10.0
Public School Library Media Center BIE School Library Media Center † Not applicable.
Item response rates. The item response rate indicates the percentage of respondents who answered a given survey question or item. The weighted SASS item response rate is calculated by dividing the base-weighted number of respondents who provided an answer to an item by the base-weighted number of respondents who were eligible to answer that item.9 Table B-3 provides a brief summary of the base-weighted item response rates for each survey. The nonresponse bias analysis conducted at the item level revealed no substantial evidence of bias in the public school district file. For further information on nonresponse bias analysis and item response rates, see the Documentation for the 2007- 08 Schools and Staffing Survey (Tourkin et al. forthcoming).
Table B-3. Summary of base-weighted item response rates, by survey: 2007-08
NOTE: Response rates were weighted using the inverse of the probability of selection (base weight). Detail may not sum to totals because of rounding. BIE refers to schools funded by the Bureau of Indian Education that are operated by the BIE, a tribe, or a private contractor and not by a regular school district. SOURCE: U.S. Department of Education, National Center for Education Statistics, Schools and Staffing Survey, “Public School, BIE School, and Private School Teacher Listing Forms, Public School District, Public School, BIE School, Private School, Public School Principal, BIE School Principal, Private School Principal, Public School Teacher, BIE School Teacher, Private School Teacher, Public School Library Media Center, and BIE School Library Media Center data files,” 2007-08.
9 For the formula to calculate the item response rate, see NCES Statistical Standards (U.S. Department of Education 2003).