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Table B-3.  Range of item response rates and percentage of items with selected rate ranges by wave and type of weighting: 2007–08 through 2009–10
Wave and type of weighting Range of item response rate Percentage of items with a response rate of 85.0 percent or more Percentage of items with a response rate of 70.0-84.9 percent Percentage of items with a response rate of less than 70.0 percent
First wave
Base-weighted 0.0-100.0 82.5 10.1 7.4
Final-weighted 0.0-100.0 83.3 8.9 7.8
Second wave without retrospective cases
Base-weighted 4.3-100.0 87.2 8.5 4.3
Final-weighted 3.8-100.0 86.8 8.9 4.3
Second wave with retrospective cases
Base-weighted 4.3-100.0 87.8 7.8 4.4
Final-weighted 3.9-100.0 87.8 7.8 4.4
Third wave
Base-weighted 0.0-100.0 84.3 12.2 3.5
Final-weighted 0.0-100.0 84.7 11.8 3.5
NOTE: Retrospective cases are respondents that were non-interviews during the second wave, but provided replies to second wave items during the third wave. Base-weighted response rates use the inverse of the probability of selection and the sampling adjustment factor. Final-weighted response rates use an initial basic weight, a SASS teacher weighting adjustment factor, a noninterview adjustment factor and a ratio adjustment factor. Detail may not sum to totals because of rounding
SOURCE: U.S. Department of Education, National Center for Education Statistics, Beginning Teacher Longitudinal Study (BTLS), "First Through Third Wave Preliminary Data File, 2007–08, 2008–09, 2009–10".