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

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BTS Home > Programs > Omnibus Surveys > Targeted Survey > 2002 National Transportation Availability and Use Survey > Public Use Data Files

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
1.2 Sum of weights	30,515,402	255,332,502	285,847,904
1.3 CV	41.65	59.96	98.32
2. Nonresponse adjustment
2.1 Number 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
2.4 Mean 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