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Key Transportation Indicators: Summary of a Workshop
The goal of the survey is to have 24,000 completed interviews per month. Developers are assuming a 70 percent response rate. The CPS interviews about 150,000 individuals in approximately 72,000 households per year. Given that one member of each household is eligible for the proposed time-use survey and given nonresponse over the course of the CPS, the maximum sample size for the time-use survey is 72,000 per year. However, because the CPS oversamples small states and the goal of the survey is to be nationally representative, the maximum available sample size is about 54,000 per year. A subsample of these 54,000 will be drawn for the time-use survey.
The proposed strategy to gather information on an individual’s time use is to use the designated day approach: each individual in the survey will be assigned a day of the week for which he or she will report activities. An attempt to interview the respondent will be made after the designated day. If the respondent cannot be reached for the designated day, the respondent will be reassigned to another designated day. In the case of Friday through Sunday, the respondent will be assigned to the subsequent Friday through Sunday. In the case of a Monday through Thursday, the respondent may be reassigned to another Monday, Tuesday, Wednesday, or Thursday. The exact assignment pattern for those in the Monday through Thursday sample has not been determined.
The period of fielding will probably be between 4 and 8 weeks and may depend on whether an individual is part of the Monday-Thursday sample or part of the other 3 (Friday, Saturday, and Sunday) samples. The distribution of samples across the days of the week has also not yet been determined; the distribution will be defined in order to minimize variances on the estimates of activities on a day, weekend day, and weekday.
The data will be collected continuously, with the samples drawn monthly. Results will be reported quarterly and annually, so that seasonal variation in time-use patterns is illuminated. The data will not be collected on major holidays.
The survey instrument will consist mainly of an activity questionnaire (the time-use diary), which will document activities done by the respondent over the preceding 24-hour period. The survey will use computer-assisted telephone interviewing and respondents will be asked to recall the timing of their activities sequentially. Respondents will also be asked where they were during the activity, whom they were with, and whether they were doing anything else at the same time, in order to record simultaneous activities. Respondents will also be asked what activities were done for pay to