Mohammad Said Zainol
Universiti Teknologi MARA
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Publication
Featured researches published by Mohammad Said Zainol.
ieee colloquium on humanities science and engineering | 2012
Siti Meriam Zahari; Mohammad Said Zainol; Muhammad Iqbal Al-Banna Bin Ismail
This study is about a development of weighted ridge M-estimator (WRM) which is believed to be a potential estimator in remedying the problems of multicollinearity under both assumptions of normality and non-normality error distributions. The proposed method has been compared with several existing estimators, namely ordinary least squares (OLS), ridge regression (RIDGE), weighted ridge (WRID) and ridge MM-estimator (RMM) using two criteria; bias and root mean square error (RMSE). In addition, the efficiency of the proposed method to the alternatives has been examined using simulation. In general, it has been found that the proposed estimator scores efficiently against the four existing estimators, particularly in the presence of high multicollinearity and under the non-normality error distribution.
STATISTICS AND OPERATIONAL RESEARCH INTERNATIONAL CONFERENCE (SORIC 2013) | 2014
Siti Meriam Zahari; Norazan Mohamed Ramli; Balkiah Moktar; Mohammad Said Zainol
In the presence of multicollinearity and multiple outliers, statistical inference of linear regression model using ordinary least squares (OLS) estimators would be severely affected and produces misleading results. To overcome this, many approaches have been investigated. These include robust methods which were reported to be less sensitive to the presence of outliers. In addition, ridge regression technique was employed to tackle multicollinearity problem. In order to mitigate both problems, a combination of ridge regression and robust methods was discussed in this study. The superiority of this approach was examined when simultaneous presence of multicollinearity and multiple outliers occurred in multiple linear regression. This study aimed to look at the performance of several well-known robust estimators; M, MM, RIDGE and robust ridge regression estimators, namely Weighted Ridge M-estimator (WRM), Weighted Ridge MM (WRMM), Ridge MM (RMM), in such a situation. Results of the study showed that in the presence of simultaneous multicollinearity and multiple outliers (in both x and y-direction), the RMM and RIDGE are more or less similar in terms of superiority over the other estimators, regardless of the number of observation, level of collinearity and percentage of outliers used. However, when outliers occurred in only single direction (y-direction), the WRMM estimator is the most superior among the robust ridge regression estimators, by producing the least variance. In conclusion, the robust ridge regression is the best alternative as compared to robust and conventional least squares estimators when dealing with simultaneous presence of multicollinearity and outliers.
international conference on statistics in science business and engineering | 2012
Noraini Noordin; Adibah Shuib; Mohammad Said Zainol; Mohamed Azam Mohamed Adil
When the dual court system cannot totally and independently function on their own, serious problems affect the administration and distribution of Islamic inheritance causing increasing trends in the number of unclaimed inheritance, high degree of ignorance among Muslims of clear procedures to claim inheritance, and lengthy as well as costly claim processes. Investigation into the processes and procedures at institutions with the authority to distribute Islamic inheritance promotes the construction of a network flow programming model that clearly describes the precedence activities in the claim processes of Islamic inheritance. In particular, preliminary analysis of data characteristics contributes significantly toward defining a new method of estimating activity durations and specifying a time-window for effective range of the estimate.
AMERICAN-MATH'10 Proceedings of the 2010 American conference on Applied mathematics | 2010
Juhari Ab Razak; Yusoff Ali; M.A. Alghoul; Mohammad Said Zainol; Azami Zaharim; K. Sopian
Archive | 2010
Noor Lide; Abu Kassim; Nor Zatul-Iffa Ismail; Zamalia Mahmud; Mohammad Said Zainol
Archive | 2012
Noraini Noordin; Adibah Shuib; Mohammad Said Zainol; Mohamed Azam Mohamed Adil
Prosiding Simantap 2016 | 2016
Muhammad Iqbal Al-Banna Bin Ismail; Siti Meriam Zahari; Mohammad Said Zainol
Engineering Letters | 2016
Wan Zakiyatussariroh Wan Husin; Mohammad Said Zainol; Norazan Mohamed Ramli
Advanced Science Letters | 2016
Wan Zakiyatussariroh Wan Husin; Norazan Mohamed Ramli; Mohammad Said Zainol; Nor Azura Md Ghani
world congress on engineering | 2015
Wan Zakiyatussariroh Wan Husin; Mohammad Said Zainol; Norazan Mohamed Ramli