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A Study on the Imputation for Missing Data in Dual-loop Vehicle Detector System  

Kim, Jeong-Yeon (서울대학교 환경대학원 교통관리)
Lee, Yeong-In (서울대학교 환경대학원 교통관리)
Baek, Seung-Geol (한국도로공사 도로교통기술원)
Nam, Gung-Seong (한국도로공사 도로교통기술원)
Publication Information
Journal of Korean Society of Transportation / v.24, no.7, 2006 , pp. 27-40 More about this Journal
Abstract
The traffic information is provided, which based on the volume of traffic, speed, occupancy collected through the currently operating Vehicle Detector System(VDS). In addition to the trend in utilization fold of traffic information is increasing gradually with the applied various fields and users. Missing data in Vehicle detector data means series of data transmitted to controller without specific property. The missing data does not have a data property, so excluded at the whole data Process Hence, increasing ratio of missing data in VDS data inflicts unreliable representation of actual traffic situation. This study presented the imputation process due out which applied the methodologies that utilized adjacent stations reference and historical data utilize about missing data. Applied imputation process methodologies to VDS data or SeoHaeAn/Kyongbu Expressway, currently operation VDS, after processes at missing data ratio of an option. Imputation process held presented to per lane-30seconds-period, and morning/afternoon/daily time scope ranges classified, and analyzed an error of imputed data preparing for actual data. The analysis results, an low error occurred relatively in the results of the imputation process way that utilized a historical data compare with adjacent stations reference methods.
Keywords
missing data; imputation; ITS; FTMS; VDS;
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