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Adjustments for Missing Data in a Swedish Vehicle Speed Survey
Linköping University, Department of Mathematics, Statistics . Linköping University, Faculty of Arts and Sciences.
2005 (English)In: Journal of Official Statistics, ISSN 0282-423X, Vol. 21, no 4, 605-615 p.Article in journal (Refereed) Published
Abstract [en]

In a Swedish vehicle speed survey for a multi-stage sample of road sites, data are collected by use of a measurement device installed on the road. Typically, some of the vehicles passing a chosen site will remain unobserved. Therefore, we suggest dividing the traffic into weighting classes. The main difficulty is to adjust the observed number of vehicles for missing data. Within class, one proposal is to add vehicles imputed by the device; another to use registration probability weighting. Models for the errors in the number of imputed vehicles, and in the estimated registration probabilities, enable theoretical evaluations of the proposals. From some empirical data, the models are evaluated.

Place, publisher, year, edition, pages
2005. Vol. 21, no 4, 605-615 p.
Keyword [en]
Weighting classes, imputation, response probability, error model
National Category
URN: urn:nbn:se:liu:diva-22112Local ID: 1213OAI: diva2:242425
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2010-04-20

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Isaksson, Annica
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Statistics Faculty of Arts and Sciences
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