"Table A1 - Household weighting for the 2002 National Transportation Availability and Use Survey sample
",
,Total*
1. Base weight,
1.1   Sample size,"40,000"
1.2   Sum of weights,"258,527,500"
2. Adjusting for unknown residential records*,
2.1 Sum of weights by residential status,"258,527,500"
a. Residential,"93,457,691"
b. Nonresidential,"139,120,111"
"c. Unknown residential status – NA, NM","25,949,698"
d. CASRO residential rate,0.402
"2.2 Sum of weights after allocating NA, NM residential records","103,885,165"
a. Residential,"93,457,691"
b. Nonresidential,0
"c. Unknown residential status - NA, NM","10,427,473"
2.3 Sum of weights after adjustment,"103,885,165"
a. Residential,"103,885,165"
b. Nonresidential,0
c. Unknown residential status-assumed to be residential,0
2.4 Coefficient of Variation (CV),1.65
3. Screener nonresponse adjustment,
3.1 Sum of weights before adjustment,"103,885,165"
a. Respondents,"74,152,690"
b. Nonrespondents,"29,732,475"
3.2 Sum of weights after adjustment,"103,885,165"
3.3   CV,7.53
4. Adjusting for subsampling – households w/o disabled residents,
4.1 Sum of weights before adjustment,"103,885,165"
a. Households with disabled,"25,435,237"
b. Households with nondisabled – subsampled,"26,420,565"
c. Households with nondisabled - not sampled,"52,029,363"
4.2 Sum of weights after adjustment,"103,885,165"
a. Households with disabled,"25,435,237"
b. Households with nondisabled – subsampled,"78,449,928"
c. Households with nondisabled - not sampled,0
4.3 CV – Households with disabled,7.5
4.4 CV – Households with nondisabled,10.66
5. Nontelephone adjustment,
5.1 Sum of weights before adjustment,"103,885,165"
5.2 Sum of weights after adjustment,"97,106,619"
5.3 Adjustment Factor,0.935
5.4 CV – Households with disabled,19.48
5.5 CV – Households with nondisabled,21.52
6. Household Poststratification,
6.1 Number of completed screener interviews,"5,162"
6.2 Sum of weights before adjustment,"97,106,619"
6.3 Sum of weights after adjustment,"105,480,101"
6.4 Adjustment factor,1.09
6.5 CV – Households with disabled,42.53
6.6 CV – Households with nondisabled,43.55
* Some rows within sections may not sum to the respective totals due to rounding.,
Source: 2002 Transportation Availability and Use Study,