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All Journal AGRISAINTIFIKA Jurnal Ilmu-ilmu Pertanian MARISEKOLA: Jurnal Matematika Riset Edukasi dan Kolaborasi VARIANSI: Journal of Statistics and Its Application on Teaching and Research Agrifo: Jurnal Agribisnis Universitas Malikussaleh
Esra Rombeallo
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Materials Science & Nanotechnology Mathematics

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Hubungan Antara Efikasi Diri dan Kemampuan Numerik dengan Hasil Belajar Siswa Materi Persamaan Kuadrat Esra Rombeallo; Vivian E. Regar; Aaltje S. Pangemanan
MARISEKOLA: Jurnal Matematika Riset Edukasi dan Kolaborasi Vol. 3 No. 2: Oktober 2022
Publisher : Jurusan Matematika FMIPA Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53682/marisekola.v3i2.1177

Abstract

Penelitian ini bertujuan untuk mengetahui hubungan dan signifikansi antara: 1) Efikasi diri dengan hasil belajar siswa materi persamaan kuadrat. 2) Kemampuan numerik dengan hasil belajar siswa materi persamaan kuadrat. 3) Efikasi diri dan kemampuan numerik dengan hasil belajar siswa materi persamaan kuadrat. Penelitian ini menggunakan metode survei bentuk korelasional. Populasi dalam penelitian ini adalah siswa kelas IX SMP Negeri 3 Tondano. Teknik pengambilan sampel menggunakan simple random sampling dengan jumlah sampel 32 siswa. Hasil penelitian menunjukkan bahwa 1) Efikasi diri memiliki hubungan linear positif yang signifikan dengan hasil belajar siswa materi persamaan kuadrat dengan koefisien korelasi sebesar 0,362 dan model hubungan  dengan kontribusi efikasi diri terhadap hasil belajar siswa materi persamaan kuadrat sebesar 13,10%. 2) Kemampuan numerik memiliki hubungan linear positif yang signifikan dengan hasil belajar siswa materi persamaan kuadrat dengan koefisien korelasi sebesar 0,881 dan model hubungan  dengan kontribusi kemampuan numerik terhadap hasil belajar siswa materi persamaan kuadrat sebesar 77,62%. 3) Efikasi diri dan kemampuan numerik memiliki hubungan linear positif yang signifikan dengan hasil belajar siswa materi persamaan kuadrat dengan koefisien korelasi sebesar 0,893 dan model hubungan  dengan kontribusi efikasi diri dan kemampuan numerik terhadap hasil belajar siswa materi persamaan kuadrat sebesar 79,74%. Berdasarkan hasil penelitian ini disimpulkan bahwa efikasi diri dan kemampuan numerik secara bersama-sama mempengaruhi hasil belajar siswa materi persamaan kuadrat.
Pemodelan dan Prediksi Pola Musiman Menggunakan Holt-Winters Pangruruk, Thesya Atarezcha; Mangiri, Nalto Batty; Rombeallo, Esra; Nurmayanti, Wiwit Pura
VARIANSI: Journal of Statistics and Its application on Teaching and Research Vol. 7 No. 2 (2025)
Publisher : Program Studi Statistika Fakultas MIPA UNM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35580/variansiunm391

Abstract

Samarinda City, with its tropical climate, experiences significant variations in rainfall throughout the year. This instability has the potential to cause impacts such as flooding, disruptions in the agricultural sector, and damage to infrastructure. This study aims to analyze and forecast the seasonal rainfall patterns in Samarinda City by applying the Holt Winters Exponential Smoothing method based on a multiplicative model. Monthly rainfall data were analyzed to identify stationarity properties in both mean and variance. The results indicate that the data are stationary in the mean but not in the variance, thus justifying the use of the Holt-Winters Multiplicative Exponential Smoothing model. Parameter estimation yielded alpha , beta , and gamma values of 1 each, with a MAPE of 50%, indicating a moderate level of accuracy. Despite the relatively high error rate, the model remains effective in illustrating seasonal patterns, which can be useful for preliminary water resource management planning in the region
Peran Bidang Pertanian dalam Pembangunan Wilayah Kabupaten Bener Meriah (Pendekatan Location Quotient dan Shift Share Analysis) Meyranti, Risky; Rombeallo, Esra; Wahyuni, Dwi
Agrifo : Jurnal Agribisnis Universitas Malikussaleh Vol. 10 No. 2 (2025): November 2025
Publisher : LPPM Universitas Malikussaleh - Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The agricultural sector plays a strategic role in supporting economic resilience. In Bener Meriah Regency, Aceh Province, agriculture serves as the main pillar of the economy, with the majority of the population working as farmers and possessing significant potential in the horticulture and plantation sub-sectors, particularly coffee. This study aims to analyze the role of the agricultural sector in regional development in Bener Meriah Regency, identify its status as a base sector, and determine leading commodities with development potential. The research uses secondary data from the BPS, the Agriculture and Plantation Office, the BAPPEDA, and other supporting literature. The analysis employs the Location Quotient (LQ) method to determine the base sector and Shift Share Analysis (SSA) to assess sector competitiveness and growth. The results show that the agricultural sector had an average LQ value of 1.80 during the 2013–2017 period, indicating it is a base sector with a production surplus that can be marketed outside the region. Positive Proportional Shift and Differential Shift values indicate significant growth at both the regency and provincial levels. Corn and coffee were identified as leading base commodities, with Gayo coffee having a high competitive advantage in both domestic and international markets. These findings highlight that strengthening the agricultural sector, through the development of leading commodities and sustainable management, can improve the welfare of the people in Bener Meriah Regency.
ANALYSIS OF ARABICA COFFEE (Coffea arabica) GROWTH UNDER THE SUREN (Toona sureni) SHADE TREE IN GENTENG VILLAGE, SUKASARI DISTRICT, SUMEDANG REGENCY Darliana, Ina; Ryadi, Giga; Wahyuni, Dwi; Meyranti, Risky; Rombeallo, Esra; Hapsari, Saprilian Stya
Agrisaintifika: Jurnal Ilmu-Ilmu Pertanian Vol. 9 No. 3 (2025): Agrisaintifika
Publisher : Universitas Veteran Bangun Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32585/ags.v9i3.7502

Abstract

Arabica coffee (Coffea arabica) is one of the leading plantation commodities whose growth is strongly influenced by environmental conditions, particularly the availability of shade from canopy trees. This study was conducted to analyze the influence of suren trees (Toona sureni) on the growth of Arabica coffee of the Ateng Super variety in Genteng Village, Sukasari District, Sumedang Regency. The research was carried out in April–May 2025 on a 0.7 ha community owned land with a sampling intensity of 15%. The observed parameters included total height, clear bole height, and diameter of suren shade trees, as well as the number and length of productive branches of coffee plants. Data were analyzed using classical assumption tests and multiple regression with t-tests through RStudio software.The results showed that the morphological characteristics of suren trees total height, clear bole height, and diameter did not directly influence the number or length of productive branches of Arabica coffee. Nevertheless, the presence of suren as a shade tree played an important role in creating a microclimate conducive to coffee growth. Microclimate observations indicated that suren shade could maintain ideal temperature and humidity ranges, namely 22–24°C and 72–83%, thereby helping stabilize the growing environment for coffee plants. With these capabilities, suren trees are considered suitable as shade species in Arabica coffee agroforestry systems. Their presence does not hinder coffee plant growth; instead, they contribute to establishing optimal environmental conditions for vegetative development and overall plant productivity. Keywords: Agroforestry, Coffea arabica, Shade tree, Rstudio, Suren
Co-Authors Aaltje S. Pangemanan Dwi Wahyuni Dwi Wahyuni Hapsari, Saprilian Stya Ina Darliana Mangiri, Nalto Batty Nurmayanti, Wiwit Pura Pangruruk , Thesya Atarezcha Pangruruk Risky Meyranti Ryadi, Giga Vivian E. Regar