@article{ref1,
title="Item nonresponse in travel surveys: causes and solutions",
journal="Transportation research circular",
year="2000",
author="Zmud, J and Arce, Constantino",
volume="",
number="E-C008",
pages="15 p.-15 p.",
abstract="This workshop resource paper reports on issues pertaining to item nonresponse in travel surveys. It presents a typology of item nonresponse errors, identifies missing data problems, and provides solutions for preventing and/or reducing data gaps at the item level. The authors conclude with recommendations for post-survey corrections to missing data, given the fact that it is impossible to achieve perfect, complete data in surveys.<p />",
language="",
issn="0097-8515",
doi="",
url="http://dx.doi.org/"
}