Didit Budi Nugroho
* Corresponding Author
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Department of Mathematics in Faculty of Science and Matemathics, Satya Wacana Christian University, and Study Center for Multidisciplinary Applied Research and Technology (SeMARTy)
Indonesia

He is a lecturer at Department of Mathematics in Faculty of Science and Matemathics, Satya Wacana Christian University, Salatiga, Indonesia. He earned his Master in Mathematics (2008) from Institut Teknologi Bandung, Indonesia, and his D.Sc. (2014) in Mathematics from Kwansei Gakuin University, Japan. He has published articles in Journal of The Japan Statistical Society, Journal of Applied Statistics, Computational Statistics, and several national journals. He is a member of the Study Center for Multidisciplinary Applied Research and Technology (SeMARTy).

Author’s contact details: Department of Mathematics, Faculty of Science and Matemathics, Satya Wacana Christian University, Jl. Diponegoro 52-60, Salatiga 50711, Central Java, Indonesia; phone: +62 298 321212 (ext. 251)/0298 3419228; e-mail: didit.budinugroho@staff.uksw.edu.

Tundjung Mahatma
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Department of Mathematics in Faculty of Science and Matemathics, Satya Wacana Christian University
Indonesia

He is a lecturer at at Department of Mathematics in Faculty of Science and Matemathics, Satya Wacana Christian University, Salatiga, Indonesia. She earned her M.Kom. (Magister Computer Science) (2007) from Universitas Gadjah Mada, Yogyakarta, Indoensia.

Author’s contact details: Department of Mathematics, Faculty of Science and Matemathics, Satya Wacana Christian University, Jl. Diponegoro 52-60, Salatiga 50711, Central Java, Indonesia; phone: +62 298 321212 (ext. 251)/0298 3419228; e-mail: t.mahatma@gmail.com.

Yulius Pratomo
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Department of Economics in Faculty Economics and Business, Salatiga, and Study Center for Multidisciplinary Applied Research and Technology (SeMARTy)
Indonesia

He is

a lecturer at at Department of Economics in Faculty Economics and Business, Satya Wacana Christian University, Salatiga, Indonesia. He earned his Master of International and Development Economics (2010) from Australia National University, Australia. He is a member of the Study Center for Multidisciplinary Applied Research and Technology (SeMARTy).

Author’s contact details: Department of Economics, Faculty of Science and Matemathics, Satya Wacana Christian University, Jl. Diponegoro 52-60, Salatiga 50711, Central Java, Indonesia; phone: +62 298 321212 (ext. 251)/0298 3419228; e-mail: yulius.pratomo@staff.uksw.edu.