Published: April 30, 2026

Research Articles

Multi-state Models for Longitudinal Data with Hidden Markov Method

10.20885/EKSAKTA.vol7.iss1.art1
Yadhurani Dewi Amritha (1), Danarnodo Danarnodo (2)
(1) Information Technology Study Program, Faculty of Engineering and Informatics, Universitas Pendidikan Nasional ,
(2) Department of Mathematics FMIPA, Universitas Gadjah Mada, Yogyakarta, 55281, Indonesia
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14

Acute Toxicity Evaluation of Phyllanthus niruri SNEDDS Formulation According to OECD 425

10.20885/EKSAKTA.vol7.iss1.art2
Uzulul Hikmah (1), Arba Pramundita Ramadani (2), Putri Julia Canastie (3), Nurul Jannatul Ma'wa (4)
(1) Pharmacy Department, Faculty of Mathematics and Natural Sciences, Universitas Islam Indonesia, Sleman, Yogyakarta, Indonesia ,
(2) Pharmacy Department, Faculty of Mathematics and Natural Sciences, Universitas Islam Indonesia, Sleman, Yogyakarta, Indonesia ,
(3) Pharmacy Department, Faculty of Mathematics and Natural Sciences, Universitas Islam Indonesia, Sleman, Yogyakarta, Indonesia ,
(4) Pharmacy Department, Faculty of Mathematics and Natural Sciences, Universitas Islam Indonesia, Sleman, Yogyakarta, Indonesia
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18

Negative Binomial Regression Analysis of Factors Influencing Tuberculosis Cases in West Java Indonesia

10.20885/EKSAKTA.vol7.iss1.art3
Aufa Fikriya (1), Shalfa Salsabilla (2), Raisah Zharifah Labibah (3), Sri Winarni (4), Defi Yusti Faidah (5), Anindya Apriliyanti Pravitasari (6), Triyani Hendrawati (7), Irlandia Ginanjar (8)
(1) Bachelor Programme of Statistics, Faculty of Mathematics and Natural Sciences, Padjadjaran University, Indonesia ,
(2) Bachelor Programme of Statistics, Faculty of Mathematics and Natural Sciences, Padjadjaran University, Indonesia ,
(3) Bachelor Programme of Statistics, Faculty of Mathematics and Natural Sciences, Padjadjaran University, Indonesia ,
(4) Department of Statistics, Faculty of Mathematics and Natural Sciences, Padjadjaran University, Indonesia ,
(5) Department of Statistics, Faculty of Mathematics and Natural Sciences, Padjadjaran University, Indonesia ,
(6) Department of Statistics, Faculty of Mathematics and Natural Sciences, Padjadjaran University, Indonesia ,
(7) Department of Statistics, Faculty of Mathematics and Natural Sciences, Padjadjaran University, Indonesia ,
(8) Department of Statistics, Faculty of Mathematics and Natural Sciences, Padjadjaran University, Indonesia
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17

Treatment of Ginger Industrial Waste Using the Carbon Dioxide Supercritical Extraction (CDSE) Method

10.20885/EKSAKTA.vol7.iss1.art4
Riyanto Riyanto (1), Naeli Khusnul Maria (2), Elfara Rahmadhika Suwarno (3)
(1) Department of Chemistry, Magister Chemistry Study Program, Islamic University of Indonesia, Sleman, 55584, Indonesia. ,
(2) Department of Chemistry, Diploma Program in Chemical Analysis, Islamic University of Indonesia, Sleman, 55584, Indonesia. ,
(3) Department of Chemistry, Magister Chemistry Study Program, Islamic University of Indonesia, Sleman, 55584, Indonesia.
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13

Orange Classification using Naïve Bayes and K-Nearest Neighbor Algorithms based on Its Physical Properties

10.20885/EKSAKTA.vol7.iss1.art5
Fadli Hafizulhaq (1), Andasuryani Andasuryani (2)
(1) Department of Agricultural and Biosystem Engineering, Faculty of Agricultural Technology, Universitas Andalas, Limau Manis, Padang, Sumatra Barat 25163, Indonesia ,
(2) Department of Agricultural and Biosystem Engineering, Faculty of Agricultural Technology, Universitas Andalas, Limau Manis, Padang, Sumatra Barat 25163, Indonesia
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10

Long-Memory Modeling of Farmers' Terms of Trade in Indonesia: A Comparative Analysis of SARIMA and SARFIMA Approaches

10.20885/EKSAKTA.vol7.iss1.art6
Miftah Rizky Viranty (1), Yeni Rahkmawati (2), Al Hujjah Asianingrum (3)
(1) Department of Statistics, Faculty of Mathematics and Natural Sciences, Universitas Lambung Mangkurat ,
(2) Department of Statistics, Faculty of Mathematics and Natural Sciences, Universitas Lambung Mangkurat ,
(3) Department of Statistics, Faculty of Mathematics and Natural Sciences, Universitas Lambung Mangkurat
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12

Clustering of Oil and Gas Pipeline Sectors with Block-Based K-Medoids Method

10.20885/EKSAKTA.vol7.iss1.art7
Dimas Zahran Wicaksana (1), Kariyam Kariyam (2), Tri Suryanto (3)
(1) Statistics Study Program, Faculty of Mathematics and Natural Sciences, Universitas Islam Indonesia, Jl. Kaliurang KM 14.5, Sleman, Special Region of Yogyakarta, 55584, Indonesia ,
(2) Statistics Study Program, Faculty of Mathematics and Natural Sciences, Universitas Islam Indonesia, Jl. Kaliurang KM 14.5, Sleman, Special Region of Yogyakarta, 55584, Indonesia ,
(3) Analyst, PT Pertamina Hulu Rokan Duri, Pertamina Complex, Duri, Bengkalis Regency, Riau 28784, Indonesia
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34

Optimizing Medan Tourist Routes Using BiogeographyBased Optimization

10.20885/EKSAKTA.vol7.iss1.art8
Fidelis Nofertinus Zai (1), Donni Andreas Nainggolan (2), Rian Kurnia (3), Erwin - (4)
(1) Department of Mathematics, Universitas Sumatera Utara ,
(2) Department of Mathematics, Universitas HKBP Nommensen Pematangsiantar ,
(3) Department of Data Science, Institut Teknologi Sumatera ,
(4) Department of Mathematics, Universitas Sumatera Utara
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28

Inflation Convergence Modeling Using Binary Logistic Regression With SGD-Newton Raphson Optimization Methods in Indonesia

10.20885/EKSAKTA.vol7.iss1.art9
Fatma Novalia Kussumarani (1), Nerissabila Uswatun Istiqomah (2), Siva Ifin Azzahra (3), Anggraini Puspita Sari (4), Sischa Wahyuning Tyas (5)
(1) Data Science Study Program, Faculty of Computer Science, Universitas Pembangunan Nasional "Veteran" East Java, Indonesia ,
(2) Data Science Study Program, Faculty of Computer Science, Universitas Pembangunan Nasional "Veteran" East Java, Indonesia ,
(3) Data Science Study Program, Faculty of Computer Science, Universitas Pembangunan Nasional "Veteran" East Java, Indonesia ,
(4) Informatics Study Program, Faculty of Computer Science, Universitas Pembangunan Nasional "Veteran" East Java, Indonesia ,
(5) Data Science Study Program, Faculty of Computer Science, Universitas Pembangunan Nasional "Veteran" East Java, Indonesia
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27

Effect of Phenol–Formaldehyde Molar Ratio on the Physicochemical Properties of Phenolic Synthetic Tanning Agent (Syntan)

10.20885/EKSAKTA.vol7.iss1.art10
Wahyu Fajar Winata (1), Prasetyo Hermawan (2), Elis Nurbalia (3)
(1) Program Studi Teknologi Pengolahan Kulit, Politeknik ATK Yogyakarta, Indonesia ,
(2) Program Studi Teknologi Pengolahan Kulit, Politeknik ATK Yogyakarta ,
(3) Program Studi Teknologi Pengolahan Kulit, Politeknik ATK Yogyakarta
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15

A Comparative Evaluation of XGBoost and LightGBM for Diabetes Mellitus Risk Prediction Using a Public Dataset and Web-Based Dashboard

10.20885/EKSAKTA.vol7.iss1.art11
Sischa Wahyuningtyas (1), Muhammad Al Hafidz (2)
(1) Department of Data Science, Faculty of Computer Science, Universitas Pembangunan Nasional "Veteran" Jawa Timur ,
(2) Information Systems, Faculty of Computer Science, Universitas Pembangunan Nasional "Veteran" Jawa Timur
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14

Production of Protease Enzymes and Bioactive Compounds by Lactic Acid Bacteria (LAB) From Broccoli (Brassica oleracea L.) Using Lactobacillus plantarum Starter

10.20885/EKSAKTA.vol7.iss1.art12
Habibi Hidayat (1), Najlaa Ayu Maharani (2), Qisti Maulani (3), Febi Indah Fajarwati (4)
(1) Chemistry Department, Faculty of Mathematics and Natural Sciences, Universitas Islam Indonesia, Jl. Kaliurang Km 14,5 Sleman, Yogyakarta, 55584, Indonesia ,
(2) Chemistry Department, Faculty of Mathematics and Natural Sciences, Universitas Islam Indonesia, Jl. Kaliurang Km 14,5 Sleman, Yogyakarta, 55584, Indonesia ,
(3) Chemistry Department, Faculty of Mathematics and Natural Sciences, Universitas Islam Indonesia, Jl. Kaliurang Km 14,5 Sleman, Yogyakarta, 55584, Indonesia ,
(4) Chemistry Department, Faculty of Mathematics and Natural Sciences, Universitas Islam Indonesia, Jl. Kaliurang Km 14,5 Sleman, Yogyakarta, 55584, Indonesia
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