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Statistical and methodological foundations of the GIDAS accident survey system

  • In Germany, in-depth accident investigations are carried out in the Hannover area since 1973. In 1999 a second region was added with surveys in Dresden and the surrounding area. Internationally, the acronym GIDAS (German In-Depth Accident Study) is commonly used for these surveys. Compared to many other countries, the sample sizes of the GIDAS surveys are much larger. The goal is to collect 1.000 accidents involving personal injuries per year and region. Data collection takes place by using a sampling procedure, which can be interpreted as a two-stage process with time intervals as primary units and accidents as secondary units. An important question is, to what extend these samples are representative for the target population from which they are drawn. Analyses show, for example, that accidents with persons killed or seriously injured are overrepresented in the samples compared to accidents with slightly injured persons. This means, that these data are subject to biases due to uncontrolled variation of sample inclusion probability. Therefore, appropriate weighting and expansion methods have to be applied in order to adjust or correct for these biases. The contribution describes the statistical and methodological principles underlying the GIDAS surveys with respect to sampling procedure, data collection and expansion. In addition, some suggestions regarding potential improvements of study design are made from a methodological point of view.

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Author:Manfred Pfeiffer, J. Schmidt
Document Type:Conference Proceeding
Date of Publication (online):2012/08/01
Contributing corporation:Institut für angewandte Verkehrs- und Tourismusforschung <Mannheim>
Release Date:2012/08/01
Tag:Analyse (math); Datenbank; Datenerfassung; Konferenz; Statistik; Unfall; Verfahren
Accident; Analysis (math); Conference; Data acquisition; Data bank; Method; Statistics
Source:2nd International Conference on ESAR "Expert Symposium on Accident Research", S. 81-87
Institutes:Sonstige / Sonstige
Dewey Decimal Classification:3 Sozialwissenschaften / 36 Soziale Probleme, Sozialdienste / 360 Soziale Probleme und Sozialdienste; Verbände
collections:BASt-Beiträge / ITRD Sachgebiete / 80 Unfallforschung
BASt-Beiträge / ITRD Sachgebiete / 81 Unfallstatistik
BASt-Beiträge / Tagungen / International Conference on ESAR / 2nd International Conference on ESAR

$Rev: 13581 $