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Citation |
Landis BW. Transp. Res. Rec. 1993; 1400: 78-81. |
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Copyright |
(Copyright © 1993, Transportation Research Board, National Research Council, National Academy of Sciences USA, Publisher SAGE Publishing) |
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DOI |
unavailable |
PMID |
unavailable |
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Abstract |
The development of sampling and surveying methodologies for statistically reliable trip characteristic surveys of land developments was researched. The two goals of the sampling methodology research were to (a) determine the effect of a monetary incentive on questionnaire response rates and (b) estimate the coefficients of variation of primary and diverted trip types and hence suggest a statistically based sample size guideline for a particular type of land development--a community-scale shopping center. The final part of the survey methodology research was to examine bias potential in land development surveys. On the basis of the finding that current sampling and surveying methods were inadequate to determine statistically reliable trip characteristics for some land developments, a hybrid prototype survey technique was designed and tested. Reduction and analysis of the test survey data revealed important findings. First, the monetary inducement of $1.00 increased the survey questionnaire response rate nearly threefold, from 11% to nearly 30%. Thus, sampling error at a given confidence level can be reduced. Second, the coefficients of variation of trip lengths varied substantially on an hourly basis, with the total day averages estimated at 0.8 and 1.6 for primary and diverted trip types, respectively. With minor verification these can be used as transferrable parameters for conducting statistically reliable surveys at other locations. And third, a test was conducted for potential intrasite sampling location bias. The test was designed to detect bias potential without affecting the data; the potential for bias was detected. The research underscores the need for establishing appropriate sampling techniques as developed in this research. Language: en |