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All Journal EJIP BIOL Jurnal Pendidikan dan Pembelajaran Khatulistiwa (JPPK) e-Dinamis Legal Opinion Primary: Jurnal Pendidikan Guru Sekolah Dasar Jurnal Ilmu-Ilmu Perikanan dan Budidaya Perairan Pendidikan Biologi Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains JEE (Jurnal Edukasi Ekobis) Enthalpy : Jurnal Ilmiah Mahasiswa Teknik Mesin BIOEDUSCIENCE JURNAL PENDIDIKAN TAMBUSAI Jurnal Teknologi Terapan Maspul Journal of English Studies (Majesty) SULTANIST: Jurnal Manajemen dan Keuangan Jurnal Ilmiah Edunomika (JIE) Akbis: Media Riset Akuntansi dan Bisnis Asian Journal of Aquatic Sciences JATI (Jurnal Mahasiswa Teknik Informatika) Jurnal Pembelajaran Pemberdayaan Masyarakat (JP2M) Budapest International Research and Critics Institute-Journal (BIRCI-Journal): Humanities and Social Sciences JIEP: Jurnal Ilmu Ekonomi dan Pembangunan J-ISCAN : Journal of Islamic Accounting Research AL-FALAH : Journal of Islamic Economics Bioscientist : Jurnal Ilmiah Biologi Prima Abdika: Jurnal Pengabdian Masyarakat Insyst : Journal of Intelligent System and Computation Ascarya: Journal of Islamic Science, Culture and Social Studies Nusantara: Journal for Southeast Asian Islamic Studies Indonesian Journal of Sport Management Majesty Journal Abrahamic Religions: Jurnal Studi Agama-Agama International Journal of Social Service and Research Journal Peqguruang: Conference Series Syar'ie: Jurnal Pemikiran Ekonomi Islam Journal of Economics, Management, Business And Accounting (JEMBA) Universitas Muhammadiyah Yogyakarta Undergraduate Conference Proceeding Journal of Agribusiness Science and Rural Development Indonesian Journal of Cancer Jurnal Ilmu Pendidikan dan Sains Islam Interdisipliner Innovative: Journal Of Social Science Research Jurnal Multidisiplin Sahombu Jurnal Pendidikan dan Ilmu Sosial Jurnal Pengabdian Masyarakat Singa Podium (JPMSIPO) STATISTIKA Electronic, Business, Management and Technology Journal Student Research Journal Journal of Geographical Sciences and Education Jurnal Sains dan Teknologi Informasi Journal of The Civil Engineering Student Journal of Mathematics, Computation and Statistics (JMATHCOS) El-Suffah: Jurnal Studi Islam Harmony Philosophy: International Journal of Islamic Religious Studies and Sharia
Ramadhan Ramadhan
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Forecasting PT Pertamina Geothermal Energy TBK (PGEO) Share Prices using the Arch-Garch Model Ramadhan, Ramadhan; Yurinanda, Sherli; Sarmada, Sarmada
Journal of Mathematics, Computations and Statistics Vol. 8 No. 2 (2025): Volume 08 Nomor 02 (Oktober 2025)
Publisher : Jurusan Matematika FMIPA UNM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35580/jmathcos.v8i2.9493

Abstract

This study focuses on forecasting the daily closing price of PT Pertamina Geothermal Energy Tbk (PGEO) stocks, recognizing the non-stationary and volatile nature of financial time series data. Traditional forecasting methods, such as the ARIMA (Autoregressive Integrated Moving Average) model, are often insufficient for such data because they rely on the assumption of homoscedasticity, or constant variance in the residuals. An analysis of PGEO's daily stock prices from November 2023 to July 2024 revealed significant fluctuations, indicating the presence of heteroscedasticity, where the variance of the residuals is not constant. In tackling this problem, the study utilized the ARCH (Autoregressive Conditional Heteroskedasticity) and GARCH (Generalized Autoregressive Conditional Heteroskedasticity) frameworks, purpose-built to identify and model the phenomenon of volatility clustering within financial datasets. By integrating the ARIMA model with GARCH, the study aimed to create a more robust forecasting tool. After testing various combinations, the MA(1)–GARCH(1,1) model was identified as the most suitable for predicting PGEO's stock prices. This model successfully captured the fluctuating volatility and produced a highly accurate forecast, as evidenced by a Mean Absolute Percentage Error (MAPE) of just 2.97%. A MAPE value below 10% is generally considered to represent a very high level of forecasting accuracy, confirming the effectiveness of the chosen model in providing reliable short-term predictions for stock market movements. Keywords: ARCH-GARCH, Stock price forecasting, ARIMA
Pembuatan Eco-Enzyme sebagai Solusi Pengolahan Limbah Rumah Tangga Junaidi, Rifqi Junaidi; Zaini, Muhammad; Ramadhan, Ramadhan; Hasan, Muhammad; Ranti, Bryen Yuzac Zein Baneka; Firmansyah, Muhammad Wahyu; Umayasari, Silvia; Sulistyo, Anggi; Aprilia, Rochmathul Duwi; Hardiansyah, Fahrudin
Jurnal Pembelajaran Pemberdayaan Masyarakat (JP2M) Vol. 2 No. 2 (2021)
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/jp2m.v2i2.10760

Abstract

Tujuan yang ingin dicapai dalam melaksanakan kegiatan pengelolaan sampah dengan membuat eco-enzyme adalah untuk membantu memudahkan masyarakat dalam mengolah limbah rumah tangga di Dusun Kandangan, Desa Gunungsari, Kecamatan Bumiaji, Kota Batu. Pada masa pandemi ini, kegiatan pengelolaan sampah ini bisa menjadi solusi dalam menghemat pengeluaran rumah tangga. Hal ini dikarenakan hasil fermentasi dari eco-enzyme mempunyai banyak manfaat seperti pembersih lantai alami, pembersih kloset, bisa melancarkan saluran air yang tersumbat. Selain itu, bisa juga digunakan untuk menyiram tanaman akan memberi hasil buah, bunga, atau panen yang lebih dan dapat mengusir serangga-serangga pengganggu. Ampas sampah organik yang sudah difermentasi bisa digunakan sebagai bahan untuk kebersihan dan juga sebagai pupuk organik yang baik. Modal untuk membuatnya juga murah dan praktis.
Analisis Penerapan Metode Profile Matching dan Weighted Product Dalam Pemilihan Karyawan Terbaik (Studi Kasus : Mini Market Hidayah) Ramadhan, Ramadhan
Jurnal Sains dan Teknologi Informasi Vol 2 No 2 (2023): Maret 2023
Publisher : Forum Kerjasama Pendidikan Tinggi (FKPT)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47065/jussi.v2i2.3292

Abstract

Mini Market Hidayah (MM Hidayah) is a cooperative company engaged in sembako. So far MM Hidayah has evaluated the performance of its employees on things that are growing only, but has never done the best employee selection. Therefore, a computerized system is needed that can provide convenience in determining the best employees. Therefore, a computerized system is needed that can provide convenience in determining the best employees. In this study proposed a computerized system that can help in the selection of the best employees, namely using profile matching methods and weighted product methods. The Profile Matching method is the process of comparing or matching profiles between individual competencies into the ideal variable predictor level competencies that must be met by the subjects studied. While Weighted Product uses multiplication to connect attribute ratings, where the rating of each attribute must be raised first with the weight of the attribute in question, the process is the same as normalization. The Profile Matching method is used for combat values while weigthed product to determine weighting criteria. If the decision-making process is assisted by a computerized decision support system, it is expected that subjectivity in decision making can be reduced and replaced by the implementation of assessment criteria for all employees.
Meningkatkan Keterampilan Proses Sains Melalui Model Pembelajaran Problem Based Learning (PBL) pada Materi Biologi Ramadhan, Ramadhan; Ningsih, Kurnia; Supartini, Sri
Bioscientist : Jurnal Ilmiah Biologi Vol. 11 No. 2 (2023): December
Publisher : Department of Biology Education, FSTT, Mandalika University of Education, Indonesia.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/bioscientist.v11i2.8034

Abstract

This research aimed to enhance the science process skills of the students through the implementation of the Problem Based Learning (PBL) teaching model in biology learning. This type of research was a classroom action research conducted in two learning cycles. Each learning cycle consisted of planning, implementation, observation, and reflection stages. The subjects of this research were 21 students from Class X.G at SMA Negeri 1 Pontianak for the academic year 2022/2023. The research data were obtained through testing techniques using instruments such as pre-test and post-test questions that reflected six aspects of science process skills: observing, interpreting observations, classifying, predicting, communicating, and formulating hypotheses. The data analysis results showed that there was an improvement in the students' science process skills for each measured aspect in both cycle I and cycle II. The average science process skill score for students in cycle I was 62.7, and in cycle II, it was 80.2. Therefore, the research results can be concluded that teaching using the Problem Based Learning (PBL) teaching model can improve students' science process skills in biology learning.
Pelatihan dan Pendampingan Pembuatan Media Pembelajaran Berbasis Multimedia Interaktif di SMK Imansyah, M Nur; Yusnarti, Mulya; Nurjannah, Nurjannah; Ramadhan, Ramadhan; Fitriatun, Fitriatun
Prima Abdika: Jurnal Pengabdian Masyarakat Vol. 4 No. 4 (2024): Volume 4 Nomor 4 Tahun 2024
Publisher : Program Studi Pendidikan Guru Sekolah Dasar Universitas Flores Ende

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37478/abdika.v4i4.4749

Abstract

The training program at SMK Negeri 2 Dompu aims to improve teachers' abilities in developing interactive multimedia-based learning media. This training was held to overcome the challenges of using conventional learning media which is less attractive to students, as well as teachers' lack of understanding regarding educational technology which affects learning effectiveness. This program is designed so that teachers can utilize digital technology to support the implementation of the Independent Curriculum and create interactive learning that is relevant to the digital era. Program implementation includes three stages: preparation, implementation, and monitoring. In the preparation stage, a teacher needs survey was carried out and training materials were prepared which included the creation of multimedia learning media and the use of the Learning Management System (LMS) application. The implementation phase includes training in creating interactive multimedia learning media, developing materials in line with the Independent Curriculum, training in using the LMS, as well as assistance in creating interactive media using the Canva and LMS applications. Monitoring is carried out after training to evaluate the success of the program through assessing participant performance and measuring results through questionnaires and analysis. Program results showed a significant increase in teachers' understanding regarding the use of multimedia in learning, with 90% of participants reporting increased understanding and 80% successfully developing multimedia-based modules. In terms of LMS usage, 70% of participants successfully created an account and started using the platform. Increasing teachers' understanding and skills in interactive multimedia and LMS technology is very positive, helping teachers utilize technology to create more interesting and effective learning, as well as monitor student progress digitally, showing great potential in developing teacher competence to face educational challenges in the technological era.
Pemeriksaan Perkara Gugatan Pembagian Harta Bersama Melalui Badan Peradilan Agama Yasir, Muhammad; Ramadhan, Ramadhan
Innovative: Journal Of Social Science Research Vol. 4 No. 3 (2024): Innovative: Journal Of Social Science Research (Special Issue)
Publisher : Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/innovative.v4i3.12214

Abstract

Ketika terjadi pemutusan hubungan perkawinan, maka timbul dampak hukum baru. Salah satu dampak hukum yang timbul adalah diharuskannya pembagian harta bersama. Harta bersama dalam perkawinan adalah harta benda yang diperoleh sepanjang perkawinan berlangsung, hal ini sebagaimana diatur dalam pasal 35 ayat (1) Undang-Undang Nomor 1 Tahun 1974 Tentang Perkawinan yang berbunyi “harta benda yang diperoleh selama perkawinan menjadi harta bersama”. Pembagian harta bersama bagi warga Negara Indonesia yang beragama Islam dilakukan di Pengadilan Agama. Hal ini sebagaimana telah diatur dalam pasal 49 dan 50 ayat (2) Undang-Undang Nomor 3 Tahun 2006 Tentang Perubahan Atas Undang-Undang Nomor 7 Tahun 1989 Tentang Peradilan Agama. Pasal tersebut pada intinya menyatakan bahwa ketika terjadi sengketa hak milik antara orang-orang yang beragama Islam berkaitan dengan masalah perkawinan, wakaf, zakat, waris, wasiat, infaq, ekonomi syariah dan shadaqah, maka sengketa tersebut diputus oleh pengadilan agama. Pada Pelaksanaanya, penyelesaian pembagian harta bersama tersebut akan melalui tahapan-tahapan yang diatur oleh Hukum Acara Perdata. Tahapan inilah yang akan menjadi dasar majelis hakim untuk memberikan putusan terkait perkara yang diperiksanya.
Metode Dakwah Para Ustadz Dalam Memberantas Perjudian dan Miras: Studi Kasus Kecamatan Simpang Kanan Aceh Singkil Ramadhan, Ramadhan
El-Suffah: Jurnal Studi Islam Vol. 1 No. 1 (2024): El-Suffah: Jurnal Studi Islam
Publisher : Yayasan Abdurrauf Cendekia Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70742/suffah.v1i1.9

Abstract

Dalam pandangan islam seringnya orang melakukan perilaku menyimpang ini menadakan bahwa kualitas hidup masyarakat mengalami penurunan ahklak, nilai dan norma, yang mengakibatkan dengan mudahnya masyarakat khususnya remaja melakukan perilaku menyimpang. Dalam penelitian ini penulis memaparkan permasalahan antara lain: 1) Bagaimana metode dakwah yang dilakukan ustadz untuk memberantas perjudian dan miras? 2) Apa saja hambatan yang di hadapi ustadz dalam memberantas perjudian dan miras? Tujuan dari penelitian ini adalah Untuk mengetahui bagaimana metode dakwah yang dilakukan ustadz untuk memberantas perjudian dan miras. Untuk mengetahui apa saja hambatan yang di hadapi ustadz dalam memberantas perjudian dan miras. Penelitian ini menggunakan penelitian kualitatif. Metode pengumpulan data diperoleh melalui observasi, wawancara, dokumentasi. Hasil penelitian Metode Dakwah Bi Al-Hikmah. Dakwah bil hikmah adalah menyampaikan dakwah dengan cara yang arif bijaksana, yaitu melakukan pendekatan sedemikian rupa sehingga pihak objek dakwah mampu melaksanakan dakwah atas kemauannya sendiri, tidak merasa ada paksaan, tekanan maupun konflik. Metode Dakwah Bi Al-Mauizhah Hasanah, Dakwah dengan cara bi al-mauizhah hasanah yaitu dengan cara memberikan metode dakwah pengajaran yang meresap hingga ke hati para mad’u. Metode Dakwah Bi Al-Mujadalah Billati Hiya Ahsan Dakwah Bi Al-Mujadalah Billati Hiya Ahsan yakni dakwah yang dilakukan dengan cara diskusi/debat. Biasanya dalam istilah debat akan ada adu argumen antara kedua pihak atau kelompok yang akan menimbulkan perselisihan antar lisan, dengan tujuan untuk merendahkan atau saling menjatuhkan lawannya.2Hambatan Yang di hadapi Ustadz Dalam Memberantas Perjudian Dan Miras adalah pola pikir masyarakat yang tidak sehat, kurangnya ilmu pengetahuan tentang ajaran agama islam, masyarakat awam dan pikiran yang kuno dan masyarakat yang tidak punya ilmu sama sekali
Penerapan Metode CRT Untuk Memupuk Antusiasme Belajar Siswa Kelas Iv Dalam Materi Aktivitas Permainan SDN Pakis 1 Surabaya Tahun Pelajaran 2024/2025 Ramadhan Ramadhan; Anung Priambodo; Marsudianto Marsudianto
Student Research Journal Vol. 2 No. 5 (2024): Oktober : Student Research Journal
Publisher : Sekolah Tinggi Ilmu Administrasi (STIA) Yappi Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/srj-yappi.v2i5.1536

Abstract

This study aims to enhance the learning enthusiasm of 4B grade students at SDN Pakis 1 Surabaya in Physical Education, Sports, and Health (PJOK) through the implementation of traditional games, specifically "gobak sodor," using a Culturally Responsive Teaching (CRT) approach. The method employed is Classroom Action Research (CAR) consisting of two cycles. Data were collected through questionnaires to measure student learning interest and direct observations during the learning process. Analysis results show an increase in student learning interest from 48.40% in the first cycle to 70.80% in the second cycle. The application of traditional games proved effective in creating a more enjoyable and interactive learning atmosphere while reinforcing cultural values. This research concludes that integrating traditional games into learning not only boosts student motivation but also provides a richer and more meaningful learning experience. Therefore, it is recommended to adopt similar approaches in other learning contexts.
Development Of Learning Video: Mangroves And Phytoplankton In Batu Ampar, West Kalimantan Daningsih, Entin; Ramadhan, Ramadhan; Da Costa, Yuliana Ovan
BIOEDUSCIENCE Vol 7 No 3 (2023): BIOEDUSCIENCE
Publisher : Universitas Muhammadiyah Prof. Dr. Hamka

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22236/jbes/11278

Abstract

Background: Mangrove forests experience rapid destruction; nonetheless, Indonesia has the widest mangrove area in the world. Conservation efforts must involve all parties, including education. This research was to develop learning video media about mangroves and phytoplankton. Methods: The method used was development research with a 4D model (defined, designed, developed, and disseminated) to develop a video containing the environmental conditions of mangroves and their unique roots in Batu Ampar. The video was evaluated by validators using a questionnaire as a research instrument. The assessment used a Likert scale. The video was also tested limitedly. Data were analyzed to calculate the content validity ratio (CVR) and the percentage category of students as respondents. Results: Learning video media about mangroves and phytoplankton in Batu Ampar obtained CVR 1,00 and categorized it as valid and suitable for learning media. Based on the limited test, students showed that both cognitive and affective were very good, but psychomotor was only a good category.
Market Basket Analysis untuk Swalayan KSU Sumber Makmur dengan Algoritma FP Growth Ramadhan, Ramadhan; Setiawan, Esther Irawati
Intelligent System and Computation Vol 2 No 1 (2020): INSYST:Journal of Intelligent System and Computation
Publisher : Institut Sains dan Teknologi Terpadu Surabaya (d/h Sekolah Tinggi Teknik Surabaya)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52985/insyst.v2i1.149

Abstract

Salah satu teknik data mining yang populer digunakan adalah association data mining atau yang biasa disebut dengan istilah market basket analysis. Market basket didefinisikan sebagai suatu itemset yang dibeli secara bersamaan oleh pelanggan dalam suatu transaksi. Market basket analysis adalah suatu sarana untuk meningkatkan penjualan. Metode ini dimulai dengan mencari sejumlah frequent itemset dan dilanjutkan dengan pembentukan aturan-aturan asosiasi. Algoritma Apriori dan frequent pattern growth adalah dua algoritma yang sangat populer untuk menemukan sejumlah frequent itemset dari data-data transaksi yang tersimpan dalam basis data. Dalam penelitian ini algoritma frequent pattern growth (FP Growth) digunakan untuk menemukan sejumlah aturan asosiasi dari basis data transaksi penjualan di Swalayan KSU Sumber Makmur (Trenggalek). Dari hasil pengolahan data didapatkan pola pembelian paling kuat berupa jika membeli pasta gigi maka dimungkinkan juga akan membeli sabun dan jika membeli shampo juga akan membeli sabun dengan tingkat keyakinan (confidence) 63% dan 62%.
Co-Authors Afrizal Tanjung Ahmad, Amirzah Aisyah Nurbaiti Aji, Kartika Restu Akhmad Qashlim, Akhmad Alfian Hamsi ALI WARDHANA Almira Keumala Ulfah Amun Amri Andi Hasriadi Hasyim Anung Priambodo Aprilia, Rochmathul Duwi AR, Silvia Arief Agus Triansyah Asrul Nirman Astuti - Aulia, Syahirah Chanda Az-zahra, Caesaria Azizah, Ghina Bahtiar Bahtiar Binti Hamit, Anis Aqilla Brahma, Bayu Budi, Mutiara Setia Budiyono, Slamet Bungkes, Panetir Bunkes, Panetir Cahyati, Martyana Dwi Casiman Sukardi Comeron, Rion Cristo, Natanael Da Costa, Yuliana Ovan Damayanti, Nurul Darwin Lie Dawi Karomati Baroroh Dawolo, Kristiani Delfianti, Delfianti DENNI JOKO PURWANTO, DENNI JOKO Destri Muliastri Dien, Alban W Diwayana Putri Nasution Efendi Efendi Eimar, Cut Rachel Elizal, Elizal Entin Daningsih Ernawati, Wa Esther Irawati Setiawan Fadillawaty Saleh, Fadillawaty Faried, Annisa Ilmi Feri Candra Firmansyah, Muhammad Wahyu Fitria Amalia Fitriatun, Fitriatun Gautama, Walta Ginawang, Asto Hakas Prayuda Hardiansyah, Fahrudin Hasanudin, La Hayati, Husna Helda Ibrahim Heny Rofizar Hermanto, Cahyo Hersanto Fajri Husein, Abdul Muhaimin Imansyah, M Nur Iskandar, Bob Andinata Ismail Ismail Ismail, Sherif Mohamed Iyan Nurdiyan Haris Izhar Salim Johanes Fernandes Andry Jumariyah, Siti Junaidi, Rifqi Junaidi Junianto, Pilifus Kadir Kadir Kadriyani, Emilda kesumah, priatna Kurnia Ningsih Kurniawan, Febriyanto Mahwiyah, Mahwiyah Marfi Yosnita Marsudianto Marsudianto Maruf, Irma Rachmawati Marzuki Marzuki Mohammad Hamdani, Mohammad Mohammad Lutfi Monika, Fanny Muhammad Fajar Purnama Muhammad Halim Pohan Muhammad Handi Pratama Muhammad Hasan Muhammad Iqbal Muhammad Yasir Muhammad Zaini Ngatmin Ningrum, Cahaya Ningsih, Kurnia Nugroho, Febriawan Ardi Nurdin Nurdin Nurjannah Nurjannah Oktapani, Silm Putri Tipa Anasi Rachmad Imbang Trittjahjono Rahma Nurzianti, Rahma Ranti, Bryen Yuzac Zein Baneka Ratna Sari Dewi Ria Kasmeri Robert Tua Siregar Rustiyarso, Rustiyarso Sabatini, Nafilla Nesantya Salbiyah, Salbiyah Sarmada, Sarmada Sasmita Sasmita Satrya Fajar Kusuma, Fitrah Savitri, Asmah Siti Nurjanah Siti Rohani Sofiyan Sofyan, Rian Fabian Sugiarto S Suhendar, Bagus Sulistyarini, Sulistyarini Sulistyo, Anggi Supartini, Sri Syafrizal Syafrizal Syamsul Rahman, Syamsul Syuhadi Syuhadi Tamin, Rosmawati Tay, En Tedi Rusman Umayasari, Silvia Valentine, Chelsea Rizky Vishnu Juwono, Vishnu Yelmida Azis Yeni, Rahma Yokhebed Yokhebed Yosephine, Satya Howen Yulianti, Eka Budi Yun Gemilang Yurinanda, Sherli Yusanti, Indah Anggraini Yusnarti, Mulya Yusria Darma Zulfah Zulfah