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All Journal Jurnal Penelitian Kesehatan Suara Forikes de Fermat : Jurnal Pendidikan Matematika Edukasia: Jurnal Pendidikan dan Pembelajaran Jurnal Ilmiah Kampus Mengajar Jurnal Keilmuan dan Keislaman Cartesian: Jurnal Pendidikan Matematika E-Jurnal Matematika
Lenny Puspita Dewi
Universitas Muhammadiyah Madiun
Religion Humanities Control & Systems Engineering Education Health Professions Languange, Linguistic, Communication & Media Mathematics Medicine & Pharmacology Nursing Public Health Social Sciences Other

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ANALISIS RISIKO PERDAGANGAN BAWANG MERAH DENGAN VOLATILITAS HISTORIS DAN VALUE AT RISK YAN ADITYA PRADANA; LENNY PUSPITA DEWI; PUTRI BALQIS AL KUBRO; SATRIYO PRIYO HANDOKO; MUHAMMAD ULUL ALBAB; FRANSISKUS FIDO EKA KURNIA NUGRAHA
E-Jurnal Matematika Vol. 15 No. 3 (2026)
Publisher : Mathematics Department, Faculty of Mathematics and Natural Sciences, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/MTK.2026.v15.i03.p511

Abstract

Shallots are one of Indonesia's most important horticultural commodities, however their prices are highly volatile, creating significant financial risks for farmers and traders. This study aims to quantify the price risk of shallot trading in East Java Province and Nganjuk Regency using historical volatility, Value at Risk (VaR), and Conditional Value at Risk (CVaR) based on rolling windows of 10, 20, &40 days. The log-return series were found to be non-normally distributed (Shapiro–Wilk, p<0.05) but stationary (ADF, p<0.05), supporting the use of the historical simulation approach. The results show that Nganjuk exhibits substantially higher price volatility than East Java, particularly over the 10-day rolling window. Consistent with this finding, the 95% VaR indicates that Nganjuk has a higher potential short-term loss than East Java (-0.0133 compared with-0.0065). Furthermore, CVaR provides a more conservative estimate of downside risk, indicating that the expected loss beyond the VaR threshold in Nganjuk is considerably larger than that estimated by VaR alone. These findings demonstrate that combining historical volatility, VaR, &CVaR provides a more comprehensive assessment of extreme price risk than volatility analysis alone, thereby extending the application of quantitative risk measurement to agricultural commodity trading and supporting risk management and policy decisions.
EKSPLORASI ETNOMATEMATIKA PADA OLEH-OLEH MAKANAN KHAS KOTA MADIUN Dewi, Lenny Puspita; Pradana, Yan Aditya; Iswari, Dian Ardifah; Shobri, Muhammad Qolbi; Ishartono, Naufal; Pratiwi, Citra Kusuma
De Fermat : Jurnal Pendidikan Matematika Vol. 9 No. 1 (2026)
Publisher : Program Studi Pendidikan Matematika, Fakultas Keguruan dan Ilmu Pendidikan, Universitas Balikpapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36277/defermat.v9i1.2488

Abstract

Negative perceptions of mathematics persist, largely due to its abstract nature and the limited use of concrete examples in instruction. Integrating cultural elements into learning can provide an alternative approach to support a more contextualized understanding of mathematical concepts. Ethnomathematics serves as a bridge between culture and mathematics within the learning process. This study aims to explore ethnomathematical concepts embedded in traditional food products of Madiun City, namely brem, bluder, and lempeng. A qualitative approach with an ethnographic method was employed. Data were collected through observation, direct measurement of the research objects, and documentation. The data were analyzed using the Miles and Huberman interactive model, including data reduction, data display, and conclusion drawing. The results of the study indicate that various mathematical concepts are present in the production and packaging processes of traditional foods. In brem, concepts of the rectangular prism, measurement, and volume were identified. In bluder, concepts of the truncated square pyramid, base area, height, and volume were identified. Meanwhile, in lempeng, the concepts of the rectangular plane figure, the rectangular prism, area, volume, and the size ratio between raw and cooked lempeng of 1:2 were found. These mathematical concepts appear implicitly in the cultural activities of the community, particularly in the production and packaging processes of traditional foods.
Co-Authors AA Sudharmawan, AA Aji, Angelia Sukma Ningrum Afrida Yono Putri Budiyono Budiyono Budiyono, Budiyono Dian Ardifah Iswari Dian Artha Kusumaningtyas Djodjok Soepardjo Erma Widyastuti Flora Ramona Sigit Prakoeswa FRANSISKUS FIDO EKA KURNIA NUGRAHA Ida Untari Ihwan Susila Irfan Miftahul Fauzi Isnaeni Umi Machromah Iswari, Dian Ardhifa Kurniaji, Ganno Tri Buana Kusparlina, Eny Pemilu Lina Alfiyani Maulia, Risma Resty MOH. MUDZAKKIR Muhammad Qolbi Shobri Muhammad Syahriandi Adhantoro MUHAMMAD ULUL ALBAB Muthiah, Suci Muzakar Isa Naufal Ishartono Nova Tri Romadloni Novia Dwi Rahmawati Novia Dwi Rahmawati Pramudito, Wysnu Pratiwi, Citra Kusuma PUTRI BALQIS AL KUBRO Putri, Angelia Sukma Ningrum Afrida Yono Rahmah, Maulida Atsaniatu Rhavida Anniza Andyani Riyadi Riyadi Roni, Roni Santosa Pradana Putra Setya Negara SATRIYO PRIYO HANDOKO Setyawati, Yayuk Trisakti Handayani Wijanarko, Ardi Yan Aditya Pradana YAN ADITYA PRADANA