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The extra zeros in traffic accident data: a study on the mixture of discrete distributions

The presence of extra zeros is commonly observed in traffic accident count data. Past research opt to the zero altered models and explain that the zeros are sourced from under reporting situation. However, there is also an argument against this statement since the zeros could be sourced from Poisson...

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Main Authors: Zamira Hasanah Zamzuri,, Mohd Syafiq Sapuan,, Kamarulzaman Ibrahim,
Format: Article
Language:English
Published: Penerbit Universiti Kebangsaan Malaysia 2018
Online Access:http://journalarticle.ukm.my/12219/1/35%20Zamira%20Hasanah%20Zamzuri.pdf
http://journalarticle.ukm.my/12219/
http://www.ukm.my/jsm/english_journals/vol47num8_2018/contentsVol47num8_2018.html
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spelling my-ukm.journal.122192018-10-16T13:44:15Z http://journalarticle.ukm.my/12219/ The extra zeros in traffic accident data: a study on the mixture of discrete distributions Zamira Hasanah Zamzuri, Mohd Syafiq Sapuan, Kamarulzaman Ibrahim, The presence of extra zeros is commonly observed in traffic accident count data. Past research opt to the zero altered models and explain that the zeros are sourced from under reporting situation. However, there is also an argument against this statement since the zeros could be sourced from Poisson trial process. Motivated by the argument, we explore the possibility of mixing several discrete distributions that can contribute to the presence of extra zeros. Four simulation studies were conducted based on two accident scenarios and two discrete distributions: Poisson and negative binomial; by considering six combinations of proportion values correspond to low, moderate and high mean values in the distribution. The results of the simulation studies concur with the claim as the presence of extra zeros is detected in most cases of mixed Poisson and mixed negative binomial data. Data sets that are dominated by Poisson (or negative binomial) with low mean show an apparent existence of extra zeros although the sample size is only 30. An illustration using a real data set concur the same findings. Hence, it is essential to consider the mixed discrete distributions as potential distributions when dealing with count data with extra zeros. This study contributes on creating awareness of the possible alternative distributions for count data with extra zeros especially in traffic accident applications. Penerbit Universiti Kebangsaan Malaysia 2018-08 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/12219/1/35%20Zamira%20Hasanah%20Zamzuri.pdf Zamira Hasanah Zamzuri, and Mohd Syafiq Sapuan, and Kamarulzaman Ibrahim, (2018) The extra zeros in traffic accident data: a study on the mixture of discrete distributions. Sains Malaysiana, 47 (8). pp. 1931-1940. ISSN 0126-6039 http://www.ukm.my/jsm/english_journals/vol47num8_2018/contentsVol47num8_2018.html
institution Universiti Kebangsaan Malaysia
building Perpustakaan Tun Sri Lanang Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Kebangsaan Malaysia
content_source UKM Journal Article Repository
url_provider http://journalarticle.ukm.my/
language English
description The presence of extra zeros is commonly observed in traffic accident count data. Past research opt to the zero altered models and explain that the zeros are sourced from under reporting situation. However, there is also an argument against this statement since the zeros could be sourced from Poisson trial process. Motivated by the argument, we explore the possibility of mixing several discrete distributions that can contribute to the presence of extra zeros. Four simulation studies were conducted based on two accident scenarios and two discrete distributions: Poisson and negative binomial; by considering six combinations of proportion values correspond to low, moderate and high mean values in the distribution. The results of the simulation studies concur with the claim as the presence of extra zeros is detected in most cases of mixed Poisson and mixed negative binomial data. Data sets that are dominated by Poisson (or negative binomial) with low mean show an apparent existence of extra zeros although the sample size is only 30. An illustration using a real data set concur the same findings. Hence, it is essential to consider the mixed discrete distributions as potential distributions when dealing with count data with extra zeros. This study contributes on creating awareness of the possible alternative distributions for count data with extra zeros especially in traffic accident applications.
format Article
author Zamira Hasanah Zamzuri,
Mohd Syafiq Sapuan,
Kamarulzaman Ibrahim,
spellingShingle Zamira Hasanah Zamzuri,
Mohd Syafiq Sapuan,
Kamarulzaman Ibrahim,
The extra zeros in traffic accident data: a study on the mixture of discrete distributions
author_facet Zamira Hasanah Zamzuri,
Mohd Syafiq Sapuan,
Kamarulzaman Ibrahim,
author_sort Zamira Hasanah Zamzuri,
title The extra zeros in traffic accident data: a study on the mixture of discrete distributions
title_short The extra zeros in traffic accident data: a study on the mixture of discrete distributions
title_full The extra zeros in traffic accident data: a study on the mixture of discrete distributions
title_fullStr The extra zeros in traffic accident data: a study on the mixture of discrete distributions
title_full_unstemmed The extra zeros in traffic accident data: a study on the mixture of discrete distributions
title_sort extra zeros in traffic accident data: a study on the mixture of discrete distributions
publisher Penerbit Universiti Kebangsaan Malaysia
publishDate 2018
url http://journalarticle.ukm.my/12219/1/35%20Zamira%20Hasanah%20Zamzuri.pdf
http://journalarticle.ukm.my/12219/
http://www.ukm.my/jsm/english_journals/vol47num8_2018/contentsVol47num8_2018.html
_version_ 1643738726836207616
score 13.211869

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