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All Journal Sinkron : Jurnal dan Penelitian Teknik Informatika BAREKENG: Jurnal Ilmu Matematika dan Terapan Justek : Jurnal Sains Dan Teknologi Saintifik : Jurnal Matematika, Sains, dan Pembelajarannya M A T H L I N E : Jurnal Matematika dan Pendidikan Matematika Math Educa Journal JURNAL PEMBELAJARAN DAN MATEMATIKA SIGMA (JPMS) Proximal: Jurnal Penelitian Matematika dan Pendidikan Matematika Journal of Computer Networks, Architecture and High Performance Computing Journal of Research in Mathematics Trends and Technology Leibniz: Jurnal Matematika Humantech : Jurnal Ilmiah Multidisiplin Indonesia Jurnal IPTEK Bagi Masyarakat Journal of Mathematics and Scientific Computing With Applications Jurnal Pijar MIPA Quadratic: Journal of Innovation and Technology in Mathematics and Mathematics Education Journal of Technology and Computer (JOTECHCOM) Jurnal Jendela Matematika
Widyasari, Rina
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Prediksi Rata-Rata Harga Emas 24 Karat Di Kota Medan Dengan Metode Arima Marlina, Wenni; Dongoran, Raisha zuhiara; Kinanti, Tri; Ginting, Iren Salsalina Br; Widyasari, Rina
JURNAL JENDELA MATEMATIKA Vol. 3 No. 02 (2025): Jurnal Jendela Matematika: Edisi Juli 2025
Publisher : CV. Jendela Edukasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.57008/jjm.v3i02.1634

Abstract

Fluktuasi harga emas yang dipengaruhi oleh berbagai faktor ekonomi global dan domestik mendorong pentingnya prediksi harga yang akurat sebagai dasar pengambilan keputusan investasi. Penelitian ini bertujuan untuk memodelkan dan memprediksi harga emas 24 karat di Kota Medan dengan menggunakan metode Autoregressive Integrated Moving Average (ARIMA). Data yang digunakan merupakan data sekunder bulanan dari Januari 2020 hingga Desember 2023 yang diperoleh dari BPS Kota Medan. Melalui tahapan identifikasi stasioneritas, estimasi parameter, dan uji diagnostik model, ditemukan bahwa model terbaik adalah ARIMA (1,2,1). Model ini menunjukkan nilai Mean Absolute Percentage Error (MAPE) sebesar 9,13%, yang mengindikasikan tingkat akurasi prediksi yang sangat baik. Hasil prediksi menunjukkan tren kenaikan harga emas sepanjang tahun 2024, dengan nilai tertinggi mencapai Rp1.109.817 pada bulan Desember. Temuan ini diharapkan dapat memberikan informasi strategis bagi masyarakat dan investor dalam merencanakan investasi emas yang lebih bijak.
INTERPOLATION METHODS ELANDT-JOHNSON TO ESTIMATE THE COMPLETE MORTALITY TABLE OF THE INDONESIAN YOUTH POPULATION BASED ON THE MORTALITY TABLE COALE-DEMENY Riningsih, Novia; Widyasari, Rina; Husein, Ismail
BAREKENG: Jurnal Ilmu Matematika dan Terapan Vol 19 No 4 (2025): BAREKENG: Journal of Mathematics and Its Application
Publisher : PATTIMURA UNIVERSITY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/barekengvol19iss4pp3005-3018

Abstract

The growth of the productive age population has continued to increase since 1971 and looks more significant in 2020. In 2010, the youth age group (16-30 years) reached 62.343.755. The population consists of 31.244.215 men and 31.099.540 women. In 2020, the youth age group will increase to 64.470.655 people, with 32.949.184 men and 31.529.270 women. The number of male youth is greater than the number of female youth. However, in 2020, youth health conditions worsened. Many young people experience severe stress and commit suicide due to depression. This will be one of the causes of the decline in young people in Indonesia. Since the Elandt-Johnson interpolation method provides reliable estimates for adult mortality, this study aims to obtain a more accurate, complete life table for Indonesian youth by applying the Elandt-Johnson interpolation method based on the Coale-Demeny West model a-bridged life table, using secondary data from the 2010 and 2020 Population Censuses provided by Statistics Indonesia. From the research results, it is known that the number of young men who survive until the age of 30 is 94.444 and young women who survive until the age of 30 is 95.724, meaning that the number of young women who survive is higher than young men, this means that the number of deaths of young men is higher than that of young women.
Co-Authors Afrina Sinaga, Serly Batubara, Fikri Husin Dongoran, Raisha zuhiara Dongoran, Rodiani Fairuz, Ersya Nurul Fransiska, Sintia Giawa, Freddy Ginting, Iren Salsalina Br Harahap, Riska Hazrah, Ardaniah Hendra Cipta Hsb, Sumawiyah Ismail Husein, Ismail Jonathan Liviera Marpaung Kartika , Dinda Kinanti, Tri Maisarah Maisarah, Maisarah Marlina, Wenni Melati, Melati Puspita Sari Lubis Muhammad Alfi Syahri Harahap Nasution, Dafa Al Qifti Nasution, Mutiah Novi Ardila Novia, Ayu Nurainun, Umi Sarah NURUL QOMARIYAH Oktaviana Oktaviana Parapat Gultom Pertiwi, Fina Nur Pratiwi, Ria Widiya Purbowati, Septi Rakhmawati, Fibri Rambe, Feby Mayori Rima Aprilia Rina Filia Sari, Rina Filia Riningsih, Novia Riri Syafitri Lubis Rizkina, Ayu Sajaratud Dur, Sajaratud Salasa Riana, Dwi Sarah, Henny May Sari, Elviana Sembiring, Tesya Yunita Siahaan, Maharani Putri Adam Siregar, Agung Lesmana Siregar, Anggi Ramadany Siregar, Machrani Adi Putri Siregar, Mei Sarah Sunanda, Bona Dea Susilowati, Rahmi Suyanto Syahfitri Lubis, Riri Yuda, Muhammad Wira