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All Journal IAES International Journal of Artificial Intelligence (IJ-AI) Media Statistika Jurnal Pendidikan dan Pembelajaran Khatulistiwa (JPPK) Jurnal Sains dan Seni ITS IPTEK Journal of Proceedings Series CAUCHY: Jurnal Matematika Murni dan Aplikasi Journal of Natural A Jurnal Tata Kota dan Daerah International Journal of Advances in Intelligent Informatics Prosiding Seminar Matematika dan Pendidikan Matematik ELINVO (Electronics, Informatics, and Vocational Education) QALAMUNA: Jurnal Pendidikan, Sosial, dan Agama BAREKENG: Jurnal Ilmu Matematika dan Terapan Journal of Islamic Monetary Economics and Finance JPEK (Jurnal Pendidikan Ekonomi dan Kewirausahaan) Musamus Journal of Physical Education and Sport (MJPES) Infotekmesin Inferensi Infotek : Jurnal Informatika dan Teknologi Afeksi: Jurnal Penelitian dan Evaluasi Pendidikan Proceeding ISETH (International Summit on Science, Technology, and Humanity) Malcom: Indonesian Journal of Machine Learning and Computer Science Prosiding Konferensi Nasional Penelitian Matematika dan Pembelajarannya Sewagati PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON DATA SCIENCE AND OFFICIAL STATISTICS Riyahuna: Jurnal Pendidikan Bahasa Arab Jurnal Terapan Pendidikan Dasar dan Menengah
Heri Kuswanto
Departemen Statistika, Institut Teknologi Sepuluh Nopember (ITS)
Arts Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Mathematics Mechanical Engineering Medicine & Pharmacology Physics Public Health Social Sciences Transportation Other

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Journal : Media Statistika

 1 
PERAMALAN LANGSUNG DAN TIDAK LANGSUNG MARKET SHARE MOBIL MENGGUNAKAN ARIMAX DENGAN EFEK VARIASI KALENDER Dea Astri Titi; Heri Kuswanto; Suhartono Suhartono
MEDIA STATISTIKA Vol 13, No 1 (2020): Media Statistika
Publisher : Department of Statistics, Faculty of Science and Mathematics, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (99.603 KB) | DOI: 10.14710/medstat.13.1.47-59

Abstract

Based on BPS data, the transportation industry sector contributed to about 8.01% of Indonesia's economic growth. The rapid growth of the transportation industry is also followed by the development of the automotive industry in Indonesia. The Exclusive Lisencee Agent of the Astra International group won a market share of 57% in April 2017. PT. Astra Daihatsu Motor, which is one of its subsidiaries, has a very rapid sales increase of 15% every year until Daihatsu's market share rises to 17.3%. Data from the Gabungan Industri Kendaraan Bermotor Indonesia (Gaikindo) shows an upward trend in car sales a month before Idul Fitri. This study carried out Daihatsu's direct and indirect market share forecasting using ARIMAX with a variety of calendar effects consisting of trends, monthly seasonal effects and Idul Fitri effects. The results indicated that  indirect forecasting through forecasting the car sales for each brand and total market using ARIMAX outperforms the others and is able to capture the pattern of the testing data. The resulting SMAPE value of ARIMAX is smaller than direct forecasting and indirect forecasting using ARIMA.
ENSEMBLE-BASED LOGISTIC REGRESSION ON HIGH-DIMENSIONAL DATA: A SIMULATION STUDY Widhianingsih, Tintrim Dwi Ary; Kuswanto, Heri; Prastyo, Dedy Dwi
MEDIA STATISTIKA Vol 17, No 1 (2024): Media Statistika
Publisher : Department of Statistics, Faculty of Science and Mathematics, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/medstat.17.1.13-24

Abstract

Dramatic computation growth encourages big data era, which induces data size escalation in various fields. Apart from huge sample size, cases arise high-dimensional data having more feature size than its samples. High-computing power compels the usage of modern approaches to deal with this typical dataset, while in practice, common logistic regression method is yet applied due to its simplicity and explainability. Applying logistic regression on high-dimensional data arises multicollinearity, overfitting, and computational complexity issues. Logistic Regression Ensemble (Lorens) and Ensemble Logistic Regression (ELR) are the logistic-regression-based alternative methods proposed to solve these problems. Lorens adopts ensemble concept with mutually exclusive feature partitions to form several subsets of data, while ELR involves feature selection in the algorithm by drawing part of features based on probability ranking value. This paper uncovers the effectiveness of Lorens and ELR applied to high-dimensional data classification through simulation study under three different scenarios, i.e., with feature size variation, for imbalanced high-dimensional data, and under multicollinearity conditions. Our simulation study reveals that ELR outperforms Lorens and obtains more stable performance over different feature sizes and imbalanced data settings. On the other hand, Lorens achieves more reliable performance than ELR on a simulation study with a multicollinearity issue.
Co-Authors A.A. Ketut Agung Cahyawan W Adatul Mukarromah Ahmad Fathoni Ahmad Shofiyuddin Ichsan Ani Budi Astuti Ary Miftakhul Huda Bani Unggul, Didik Beben Sutara, Beben Dea Astri Titi Dedy Dwi Prastyo Dwi Rantini Effendi, Magdalena Eka Supriatna Ekarini, Fitria Faiqah, Elok Farida Ariany Fatul, Fitasari Fithriasari, Kartika Fitri Ayu Kusumawati, Fitri Ayu Hady Suryono Hariadi Hariadi Hia, Supriadi Idrus Syahzaqi Indah Idamawarti, Itamara Irhamah Irhamah - Jamaluddin Jamaluddin Kinanti Hanugera Gusti Koesniawanto, Moch. Made Ayu Dwi Octavanny Marsono Marsono Moch. Koesniawanto Mohammad Hatta Rafsanjani Muhammad Hisyam Lee Munjahid Nitivijaya, Maulidiah Noorihsan, Sandrian Yulian Firmansyah Novi Ajeng Salehah Nur Iriawan Paramita, NLP Satyaning Pradnya Pramono Dwi Utomo Puspita Kartikasari Qori’atunnadyah, Marita Raditya Sukmana Rahmawati, Hasri Rouhan, Asva Abadila Rumaisa Kruba S Suhartono, S Salafiyah Isnawati Sediono, Sediono Setiawan Setiawan Sri Aryani, Sri Suhartono Suhartono Suhartono Suhartono Suhartono Suhartono Suhartono Suhartono Suryansah Susila, Muktar Redy Sutikno Sutikno Ulfa Siti Nuraini Widhianingsih, Tintrim Dwi Ary Wiwiek Setya Winahju