Citation

Ochoa DL, Ramsey GM. Transp. Res. Rec. 1986; 1090: 36-42.

Copyright

(Copyright © 1986, Transportation Research Board, National Research Council, National Academy of Sciences USA, Publisher SAGE Publishing)

DOI

unavailable

PMID

unavailable

Abstract

The California Department of Transportation conducted in-person home interview travel surveys in six counties of the state before converting to the telephone survey technique in 1979. The surveys updated existing data bases that support the development of regional travel forecasting models. During the survey period cluster sampling was employed to minimize travel time for survey interviewers and facilitate call-back procedures. Because cluster sampling was used, the simple random sample model often cited s/(n1/2) was not appropriate for estimating sampling error because that formula tends to underestimate actual standard errors. Estimates of sampling error for the surveys were thus made using the method of "replicated subsampling", which takes sample clustering into account and yields a higher total standard error than does the conventional method. This paper is intended to illustrate application of replicated subsampling in estimating sampling error for cluster sample travel surveys. Comparisons of standard error derived using the method of replicated subsampling are made with standard errors derived by the conventional formula, which assumes a simple random sampling design. Replicated subsampling provides an unbiased, reliable, and generally applicable framework for estimating sampling error.

Record URL:
http://onlinepubs.trb.org/Onlinepubs/trr/1986/1090/1090-006.pdf

Language: en

Keywords

REGIONAL PLANNING - Transportation; TRANSPORTATION; TECHNOLOGICAL FORECASTING