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Table A2 - Extended interview weighting for 2002 National Transportation Availability and Use Survey sample

Table A2 - Extended interview weighting for 2002 National Transportation Availability and Use Survey sample

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  Disabled* Nondisabled* Total*
1. Person initial weights      
1.1 Number of sampled persons 2,531 3,224 5,755
1.2Sum of weights 30,515,402 255,332,502 285,847,904
1.3 CV 41.65 59.96 98.32
2. Nonresponse adjustment        
2.1Number of completed adult interviews 2,241 2,778 5,019
2.2 Sum of weights before adjustment 30,515,402 255,332,502 285,847,904
a.Eligible respondents 27,038,064 218,212,620 245,250,684
b.Eligible nonrespondents 2,911,239 29,228,078 32,139,317
c. Ineligibles 566,098 7,891,805 8,457,903
2.3 Sum of weights after adjustment 30,515,402 255,332,502 285,847,904
a. Eligible respondents 29,949,303 247,440,698 277,390,001
b. Eligible nonrespondents 0 0 0
c. Ineligibles 566,098 7,891,805 8,457,903
2.4Mean adjustment factor 1.11 1.14 1.12
2.5 CV 41.60 59.56 98.91
3. Trimming adjustment**      
3.1 Number of trimmed records 8 4 12
3.2 Sum of weights before trimming adjustment 33,453,727 243,936,274 277,390,001
3.3 CV before trimming 117.58 66.58 98.91
3.3 Sum of weights after trimming adjustment 32,865,554 243,526,307 276,391,861
3.4 CV after trimming 98.78 65.99 97.92
4. Raking adjustment***      
4.1 Number of completed adult interviews 2,061 2,958 5,019
4.2 Sum of weights after adjustment 49,499,318 224,143,955 273,643,273
4.3 Mean adjustment factor 1.48 0.92 0.99
4.4 CV 113.70 77.00 99.80
4.5 Mean weight 24,017.14 75,775.51 54,521.47

* Some rows within sections may not sum to the respective totals due to rounding.

** Counts of completed interviews and sums of weights in sections 3 and 4 are based on self-reported disability status (census definition) rather than sampling disability status. For this reason lines 2.3.a and 3.2 are not equal within groups.

*** The raking adjustment accounts for telephone interruption by including an additional raking dimension. See Section 4.4 for further details

Source: 2002 Transportation Availability and Use Study