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Content
Sample Design
Sample
Construction
Screening
to Determine Household Eligibility
Selection of Respondent Within Household
Young
Adult Oversample
Initial
Contact
Spanish
Language Interviews
Refusal
Conversion
Field
Outcomes
Sample
Weighting
Precision
of Sample Estimates
Estimating
Statistical Significance
Statistical
Comparisons Between Samples
References
Technical
Report Documentation
APPENDIX
A1: English Language Questionnaire Version 1
APPENDIX A2: English
Language Questionnaire Version 2
APPENDIX B1: Spanish Language
Questionnaire Version 1
APPENDIX
B2: SPANISH Language
Questionnaire Version 2
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Young
Adult Oversample
The survey design
specified an oversample of 16-39 year olds in the achieved sample in order
to permit more detailed analysis of this subset of the population. A random
sample of all persons age 16 and over in an RDD sample of 4,000 households
yields too few individuals in this range to allow very close examination.
Therefore, to increase the subsample sizes of the 16-39 year olds, within
a projectable national sample, an independent national sample was conducted
of that population. The allocation of sample by region for the young adult
oversample is proportional to the regional distribution of that population.
The household selection procedures through RDD is the same for the oversample
as for the national cross-sectional sample.
The screening criteria
for the oversample were different from the simple cross-section in that
households were screened for persons age 16 to 39. This systematic screening
of a national probability sample of households for a subset of the total
household population should yield a random sample of that population.
As in the case of the simple cross-sectional sample, if there was only
one eligible respondent in the household then he or she was selected.
If there were more than one eligible respondent, then the "most recent/next
birthday" method of selection was used. The oversample screener script
is presented in Figure 2.
FIGURE 2
Within Household Selection Procedure:
Young Adult Oversample
-
TIME START: _____________
TIME END: _____________
DATE: _____________ BATCH #:____________ CATI
RESP. #: ______________
SAMPLE POINT #: ___ ___ ___ GENDER OF RESP.:
MALE [ ] FEMALE [ ]
RESP PHONE NUMBER: ___________________________________________________
RESP POSITION IN HOUSEHOLD: ________________________________________________
INTERVIEWER NAME: __________________________________________________________
THIS INTERVIEW IS A: COMPLETE [ ] CALLBACK
FOR COMPLETION [ ]
TERMINATE AT Q._____ [ ]
- - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - -
-
INTRODUCTION TO BE ADMINISTERED TO ANY ADULT
HOUSEHOLD MEMBER: Hello, I'm calling for the U.S. Department
of Transportation. We are conducting a study of Americans' driving
habits and their attitudes about current driving laws. The interview
is completely confidential.
D1. Is there anyone age 16 to 39 years old living in your
household?
|---------------- Yes [ASK Q.D2].................1
| No [SCREEN
OUT - D1 AGE].........2
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D2. Could I speak to the person in your
household, age 16 to 39, who has had the most recent/next birthday?
Respondent is that person [CONTINUE WITH
CATI AND ENTER Q.1 AS D2]................1
Other respondent came to phone [ CONTINUE
WITH CATI AND ENTER Q.1 AS D2]......2
Respondent is not available [ARRANGE CALLBACK
AND RECORD IT, ALONG WITH
THE RESPONDENT'S FIRST NAME OR HH POSITION, ON THE SAMPLE
SHEET.
ATTACH THIS SHEET TO SAMPLE AFTER FILLING OUT APPLICABLE RESPONDENT
INFO AT THE TOP. WHEN THE NEXT INTERVIEWER REACHES THIS PERSON,
THEY WILL ENTER Q.1 AS D2].......................3
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Table 2 presents the national population figures and projected sample
distribution by age and sex for the total sample of 4,000 respondents,
including the cross-sectional sample of 3,000 respondents and the oversample
of 1,000 persons age 16-39.
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TABLE 2
Population and Expected Sample Distribution*
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|
Population
|
Sample
|
|
Total
Population
(thousands) |
% |
Cross-
Sectional
Sample |
Young
Adult
Sample |
Total |
| Total (16+) |
207,145 |
100 |
3,000 |
1,000 |
4,000 |
Males (16+) |
100,049 |
48.3 |
1,449 |
505 |
1,954 |
| 16-20 |
9,890 |
4.8 |
143 |
104 |
247 |
| 21-29 |
16,481 |
8.0 |
239 |
174 |
413 |
| 30-39 |
21,431 |
10.4 |
310 |
226 |
536 |
| 40-64 |
38,153 |
18.4 |
553 |
- |
553 |
| 65+ |
14,093 |
6.8 |
204 |
- |
204 |
Females(16+) |
107,095 |
51.7 |
1551 |
495 |
2,046 |
| 16-20 |
9,293 |
4.5 |
135 |
98 |
233 |
| 21-29 |
16,068 |
7.8 |
233 |
170 |
402 |
| 30-39 |
21,537 |
10.4 |
312 |
227 |
539 |
| 40-64 |
40,083 |
19.4 |
581 |
- |
581 |
| 65+ |
20,113 |
9.7 |
291 |
- |
291 |
| *Source:
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Population
Projections of the United States by Age, Sex, Race and Hispanic
Origin: 1995 to 2050. Bureau of the Census. Middle Series
estimates for February, 1998. |
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