Rounding of Arrival and Departure Times in Travel Surveys: An Interpretation in Terms of Scheduled Activities

摘要: In travel surveys most respondents apply rounding of departure andarrival times to multiples 5, 15 and 30 minutes: in the annual Dutch survey about 85-95 percent all reported are 'round' ones. We estimate models for arrival times. The model allows one compute probability that a time m (say m=9: am) means actual equals n m=9:21 am). Departure appear be rounded much more frequently than An interpretation this result is offered by distinguishing between scheduled non-scheduled activities, addressing role transitory activities. argue explicitly will have at least three positive effects. 1. It leads considerably better treatment variances 2. enables avoid biases computation average transport based on surveys. 3. overcomes problem use data minute-per-minute records development number persons traffic displays erratic patterns.