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Pengujian Pertumbuhan Bibit Anggur Melalui Pemberian Pupuk Menggunakan Rancangan Acak Lengkap Dimas Arza Nugraha; M. Fajar Alif; Nova Oktavia Sitinjak; Rini Sartika; Sudianto Manullang; Putri Maulidina Fadilah
Interdisciplinary Explorations in Research Journal Vol. 2 No. 3 (2024)
Publisher : PT. Sharia Journal and Education Center

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Abstract

This study aims to provide the effect of various types of fertilizer on the growth of grape seedlings using a Completely Randomized Design (CRD). The study was conducted with five fertilizer treatments, namely NPK, White KNO₃, Magnesium, Humic Acid, and Compost, and four applications for each treatment, resulting in a total of 20 experimental units. The planting medium used was soil with a neutral pH, according to the optimal conditions for grape growth. The parameters observed were the length of the grape seedlings measured using a measuring instrument. The results of the analysis of variance (ANOVA) showed that fertilizer administration had a significant effect on the length of the grape seedlings. Duncan's further test divided the treatments into three groups, with NPK fertilizer giving the best results, achieving an average seedling length of 164.25 cm, followed by White KNO₃, Humic Acid, and Magnesium with similar results but not significantly different. Compost fertilizer produced the lowest seedling length of 93.75 cm. Based on these findings, NPK fertilizer is recommended to increase the growth of grape seedlings optimally.
Pengaruh Harga Produk dan Layanan Terhadap Inflasi di Kabupaten Deli Serdang Menggunakan Metode Rancangan Acak Kelompok Lengkap (RAKL) Achmad Fajri Romadhoni; Ayu Widya Sari; Ega Ananda br Sembiring; Ishak Munawar; Sudianto Manullang; Putri Maulidina Fadilah
Interdisciplinary Explorations in Research Journal Vol. 2 No. 3 (2024)
Publisher : PT. Sharia Journal and Education Center

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Abstract

This research explores the influence of product and service prices on the inflation rate in Deli Serdang Regency, using the Complete Randomized Block Design (RAKL) method. The data used includes the inflation rate of eight categories of goods and services reported by the Central Statistics Agency during the period January to June 2024. The results of variance analysis show that neither the goods/services category factor nor product prices have a significant influence on the inflation rate in the research period. This study provides initial insight into the relationship between prices and inflation and opens up opportunities for further research with broader data coverage and additional variables.
Penerapan Rancangan Acak Lengkap dalam Penilaian Cara Mengajar (Studi Kasus: Jurusan Matematika FMIPA Unimed) Dewi Lowisa Br Purba; Indah Febriani Sagala; Nagita Adella; Reski Augustian. S; Sudianto Manullang; Putri Maulidina Fadilah
Interdisciplinary Explorations in Research Journal Vol. 2 No. 3 (2024)
Publisher : PT. Sharia Journal and Education Center

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Abstract

This research aims to evaluate the effectiveness of lecturers' teaching methods in the Mathematics Department, FMIPA, Medan State University (Unimed) using a Completely Randomized Design (RAL) approach. This method allows controlled testing of variability between groups of students, with a sample of 60 students selected at simple random. Data was collected through a questionnaire that measured student perceptions of teaching methods, followed by analysis using ANOVA. The research results show that the teaching methods applied have a significant influence on student learning outcomes, with differences between groups detected through statistical tests. This research provides recommendations for adopting more effective teaching methods in improving the quality of education in the academic environment.
ENHANCING LQ45 STOCK PRICE FORECASTING USING LSTM MODEL Sinaga, Marlina Setia; Iskandar, Said; Manullang, Sudianto; Arnita, Arnita; Marpaung, Faridawaty; Buulolo, Fatizanolo
BAREKENG: Jurnal Ilmu Matematika dan Terapan Vol 20 No 1 (2026): BAREKENG: Journal of Mathematics and Its Application
Publisher : PATTIMURA UNIVERSITY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/barekengvol20iss1pp0427-0438

Abstract

Stocks listed in the LQ45 index represent companies with high liquidity, large market capitalization, and strong fundamentals, making them pivotal to the movements of the Indonesian capital market. This study selects eight LQ45-listed stocks from the energy and mining sectors, as well as the banking sector. Historical data spanning a 10-year period from February 28, 2015, to February 28, 2025. This research aims to mitigate the impact of stock market dynamics, a significant challenge for investor decision-making. The Long Short-Term Memory (LSTM) method was employed to forecast stock prices using four variables: opening, highest, lowest, and closing prices. The LSTM architecture was chosen because its gated memory cells can effectively capture long‑term dependencies and nonlinear patterns in financial time series, thereby aligning with the research objective of minimizing forecasting error under volatile market conditions. Evaluation results using the Mean Absolute Percentage Error (MAPE) showed prediction errors below 2.5%, indicating relatively low forecasting error. Root Mean Squared Error (RMSE) values varied depending on stock price volatility. Companies exhibiting higher stock prices, such as Indo Tambangraya Megah Tbk (ITMG), demonstrate larger RMSE values. For opening prices, predictive accuracy was notably strong, with MAPE values consistently below 1.26%. This suggests that opening prices, influenced by pre-market sentiment and historical data, are more stable and easier to predict compared to other price variables.
Co-Authors Abdurahman Abdurrahman Achmad Fajri Romadhoni Adiva, Cut Tasya Adrianto, Ilham Agnes Yulia Saragih Alvi Sahrin Nasution Ameliya, Ameliya Anastasya Carity S, Disty Angelica Carolina Tambunan Anggi Nur Ananda Saragih Annisa Hidayah Anshari, Farhan Aqil, Muhammad Fachri Aritonang, Anggi Pasha Arnita Arnita Aulia Putri Br. Manurung Aulia, Ilmi Aulia, Widi Ayu Lestari Sihombing Ayu Widya Sari Azizi, Muhammad Farhan Azmi, Khoiriyati Bakti Ulina Lumbangaol Botrina Adisti Simangunsong Br Barus, Jesika Casadae Wanda Buulolo, Fatizanolo Cahaya Destia Regar Cahya Chosya Carles Syahputra Hulu Cecilia Br Parangin-angin Chairunisah Chairunisah, Chairunisah Chandra, Melissa Christine Simatupang Clara Jocelyn Harefa Dani, Danu Rama Desrinawati Tindaon Dewi Lowisa Br Purba Diah Ayu Lestari DIdi Febrian Dilla Nurfadiah Dimas Arza Nugraha Dinda Meyliana Dinda Putri Namira Harahap Dita Aryani Ega Ananda Br Sembiring Eldora, Felicia Erlinawaty Simanjuntak Fachrihz Effendy Fadilah, Putri Maulidina Fannisa Rahmadani Febi Hijriana Felicia Eldora Femi Ezrani Siantur Ginting, Puspa Arinda Ginting, Sindi Rahmadhani Gultom, Ledy Meva Tiurma Hanafi Irsyad Pulungan Handayani, Silvia Mariah Handre Gabriel Pinem Hanifah Rusydah Hasibuan, Eka Sri Hartini Hasibuan, Valen Silvana Hutabarat, Reinaldo F.M Hutabarat, Reinaldo Fernandes Matheus Hutapea, Brian Hutasoit, Elizabeth Indah Febriani Sagala Ira Selvia Ritonga Irvina Abelia Harahap Ishak Munawar Ivena Simanjuntak Kairani, Nerli Kanaya, Nayla Yasyra Kanaya, Niquita Sepha Karin Aulia Putri Kasih Simbolon Khoiriyati Azmi Lirana Sapriani Gulo Lubis, Hafiz Khalik Lubis, Raja Harly Anugrah Lubis, Revan Kurniawan Lubis, Rhamanda Ardiyansyah M. Fajar Alif M. Shadri Ismaun Lubis M.E. Ernawati Siregar Manihuruk, Oliver Juan Manihuruk, Oliver Juan Gery Manullang, Maria Ayuni Isabella Manullang, Nurul Ain Farhana Marpaung, Faridawaty Melissa Chandra Mizan Hasibuan Muthiah, Ade Naila N Simanjuntak, Christina Nadia Amalia, Sisti Nadya, Fauza Nagita Adella Nainggolan, Millenia Naomi Febrina Sitompul Nasution, Alvi Sahri Nasution, Alvi Sahrin Nasution, Tri Annisya Aini Nia Devi Friskauly Niska, Debi Yandra Nova Oktavia Sitinjak Novan Setyadi Nur Maulidya Rizky Nurhasanah - Siregar Nurjannah, Annisa Nurkhalizah, Rezeki Nursani Salsabillah Akza Nurul Ain Farhana Nurul Ain Farhana Panggabean, Natanael Pardomuan - Sitompul Pasaribu, Jansperi Pebrianti, Lidia Piliang, Yumna Khairi Amani Pulungan, Zakiy Maulana Purba, Rut Omega Putri Aisyah Putri Maulidina Fadilah Raihan Riyadi Siregar Reski Augustian. S Revan Kurniawan Lubis Rifka Annaria Sibuea Rini Sartika Risa Rozzaqi Rambe Rotua Evelyn Tesalonika Sinambela Said . Iskandar Saragih, Agnes Yulia Saragih, Anggi Nur Ananda Saribu, Fransisco Dolok Siagian, Yerikho Aprilio Siahaan, Daniel Tingkos Sianturi, GiaColin Alfaro Samuel Sibarani, Mikhael Agus Tua Siboro, Alio Hutaperi Sihombing, Sri Yuni Utari Silaban, Dewi Fortuna Simamora, Elmanani Simanjuntak, Christina N Simanjuntak, Natalia Anggriani Simbolon, Taing Pebrieni Simorangkir, Tri Gustini Sinaga, Marlina Setia Sisti Nadia Amalia Sitanggang, Agnes Miranda Sitanggang, Santa Falare Sitorus, Novita Atika Situmorang, Audrey Situmorang, Ruth Remita Asianna Talitha Nakhwan Hasibuan Tamara, Angga Tambunan, Combest Prajogo Tarigan, Dandi Rifa'i Taufiq, Insan Tia Ramadani Tobing, Rizky Saputra Tri Annisya Aini Nst Tumanggor, Abednego Pradja Turnip, Leoni Fristy Wahyu Indra Syahputra Wibowo, Anastasya Putri Widi Ningsih Panggabean Widya Narti Lubis Witri Wardani Hulu Yoan Olivia Sirait Yolanda Ulyartha L. Tobing Zalianti, Retno Ayu Zulfahmi Indra, Zulfahmi