Imputing missing values in modelling the PM10 concentrations
Missing values have always been a problem in analysis. Most exclude the missing values from the analyses which may lead to biased parameter estimates. Some imputations methods are considered in this paper in which simulation study is conducted to compare three methods of imputation namely mean subst...
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Universiti Kebangsaan Malaysia
2014
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my-ukm.journal.78242016-12-14T06:45:19Z http://journalarticle.ukm.my/7824/ Imputing missing values in modelling the PM10 concentrations Nuradhiathy Abd Razak, Yong Zulina Zubairi, Rossita M. Yunus, Missing values have always been a problem in analysis. Most exclude the missing values from the analyses which may lead to biased parameter estimates. Some imputations methods are considered in this paper in which simulation study is conducted to compare three methods of imputation namely mean substitution, hot deck and expectation maximization (EM) imputation. The EM imputation is found to be superior especially when the percentage of missing values is high as it constantly gives low RMSE as compared with other two methods. The EM imputation method is then applied to the PM10 concentrations data set for the southwest and northeast monsoons in Petaling Jaya and Seberang Perai, Malaysia which has missing values. Four types of distributions, namely the Weibull, lognormal, gamma and Gumbel distribution are considered to describe the PM10 concentrations. The Weibull distribution gives the best fit for the southwest monsoon data for Petaling Jaya. The lognormal distribution outperformed the others in describing the southwest monsoon in Seberang Perai. Meanwhile, for the northeast monsoon in both locations, gamma distribution is the best distribution to describe the data. Universiti Kebangsaan Malaysia 2014-10 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/7824/1/18_Nuradhiathy.pdf Nuradhiathy Abd Razak, and Yong Zulina Zubairi, and Rossita M. Yunus, (2014) Imputing missing values in modelling the PM10 concentrations. Sains Malaysiana, 43 (10). pp. 1599-1607. ISSN 0126-6039 http://www.ukm.my/jsm/ |
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Missing values have always been a problem in analysis. Most exclude the missing values from the analyses which may lead to biased parameter estimates. Some imputations methods are considered in this paper in which simulation study is conducted to compare three methods of imputation namely mean substitution, hot deck and expectation maximization (EM) imputation. The EM imputation is found to be superior especially when the percentage of missing values is high as it constantly gives low RMSE as compared with other two methods. The EM imputation method is then applied to the PM10 concentrations data set for the southwest and northeast monsoons in Petaling Jaya and Seberang Perai, Malaysia which has missing values. Four types of distributions, namely the Weibull, lognormal, gamma and Gumbel distribution are considered to describe the PM10 concentrations. The Weibull distribution gives the best fit for the southwest monsoon data for Petaling Jaya. The lognormal distribution outperformed the others in describing the southwest monsoon in Seberang Perai. Meanwhile, for the northeast monsoon in both locations, gamma distribution is the best distribution to describe the data. |
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Article |
author |
Nuradhiathy Abd Razak, Yong Zulina Zubairi, Rossita M. Yunus, |
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Nuradhiathy Abd Razak, Yong Zulina Zubairi, Rossita M. Yunus, Imputing missing values in modelling the PM10 concentrations |
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Nuradhiathy Abd Razak, Yong Zulina Zubairi, Rossita M. Yunus, |
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Nuradhiathy Abd Razak, |
title |
Imputing missing values in modelling the PM10 concentrations |
title_short |
Imputing missing values in modelling the PM10 concentrations |
title_full |
Imputing missing values in modelling the PM10 concentrations |
title_fullStr |
Imputing missing values in modelling the PM10 concentrations |
title_full_unstemmed |
Imputing missing values in modelling the PM10 concentrations |
title_sort |
imputing missing values in modelling the pm10 concentrations |
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Universiti Kebangsaan Malaysia |
publishDate |
2014 |
url |
http://journalarticle.ukm.my/7824/1/18_Nuradhiathy.pdf http://journalarticle.ukm.my/7824/ http://www.ukm.my/jsm/ |
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