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All Journal Jurnal Matematika Sains dan Teknologi M A T H L I N E : Jurnal Matematika dan Pendidikan Matematika International Journal of Research in Community Services International Journal of Global Operations Research International Journal of Quantitative Research and Modeling International Journal of Ethno-Sciences and Education Research Journal of Mathematics, Computation and Statistics (JMATHCOS) International Journal of Mathematics, Statistics, and Computing International Journal of Humanities, Law, and Politics International Journal of Health, Medicine, and Sports International Journal of Linguistics, Communication, and Broadcasting
kalfin Kalfin
Department Of Statistics, Faculty Of Mathematics And Natural Sciences, Universitas Padjadjaran
Religion Agriculture, Biological Sciences & Forestry Humanities Computer Science & IT Decision Sciences, Operations Research & Management Dentistry Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mathematics Medicine & Pharmacology Nursing Physics Public Health Social Sciences Transportation Other

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Journal : International Journal of Quantitative Research and Modeling

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Model for Determining Earth's Gravitational Acceleration on a Mathematical Pendulum Azahra, Astrid Sulistya; Yuningsih, Siti Hadiaty; Kalfin, Kalfin
International Journal of Quantitative Research and Modeling Vol 5, No 3 (2024)
Publisher : Research Collaboration Community (RCC)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46336/ijqrm.v5i3.760

Abstract

Gravity is an accelerating property of the earth that causes objects to fall freely. The acceleration of gravity is not the same at every place on the Earth's surface. To measure the Earth's gravity (small g), scientists can use various techniques, such as dropping a mass from a certain height and measuring the time it takes to fall to the ground or using a mathematical pendulum to measure the period of oscillation and use it to calculate the acceleration due to gravity. In this paper, a study of the mathematical pendulum in the measurement of the Earth's gravitational acceleration is conducted, and the measurement experiment is illustrated. Method To measure the length of the pendulum, you must have a ruler, meter stick, or tape measure. At the top end of the string, start the measurement at the point where the string rotates out of place. Then, measure up to the center of the pendulum, which is the object hanging on the string. From the results of this study, it can be concluded that the value of the period of a pendulum is affected by several factors, including the length of the rope used and the angle of initial deviation, while the factors that do not affect the period are the mass and diameter of the pendulum.
The Effect of Macroeconomic Variables on Indonesia's Import Value Using the OLS Method Januaviani, Trisha Magdalena Adelheid; Kalfin; Hutabarat, Aned Miranda; Nikita; Musdaifah, Selvy; Nacong, Nasria
International Journal of Quantitative Research and Modeling Vol. 6 No. 3 (2025): International Journal of Quantitative Research and Modeling (IJQRM)
Publisher : Research Collaboration Community (RCC)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46336/ijqrm.v6i3.1070

Abstract

This study analyzes the factors influencing Indonesia’s import value during the period 2021–2025 using the Ordinary Least Squares (OLS) method. To ensure the validity of the model, a series of classical assumption tests were conducted in accordance with the Best Linear Unbiased Estimator (BLUE) criteria, including tests for normality, multicollinearity, heteroscedasticity, and autocorrelation. The data were obtained from official publications of the Central Statistics Agency (BPS) and other relevant sources. The estimation results demonstrate that the independent variables, namely the exchange rate (X₁), national income (X₂), foreign exchange reserves (X₃), inflation rate (X₄), and interest rate (X₅), exert varying effects on Indonesia’s import value, with certain variables exhibiting significant influence while others remain insignificant. The model is free from violations of the classical assumptions, thereby meeting the criteria of the Best Linear Unbiased Estimator (BLUE). Keywords: Import Value, OLS, Classical Assumption Tests, Macroeconomics
Co-Authors Agung Prabowo Ahmad Alfarizy andrian, riza Ardiansyah, Muhammad Naufal Astrid Sulistya Azahra Azahra, Astrid Sulistya Bakti Siregar Bima Mulia binti Abdullah Suhaimi, Nurnisaa Brigita Tiara Elgityana Melantika Chun Wang Denny Razzianto Dewi Ratnasari Dewi, Puja Kalima Diantini, Ni Luh Sri Erwen, Ivana Valencia Eti Suminartika Fabian, Natanael Tio Farelino, Caesar Gracia, Ribka Hadiaty Y, Siti Hadiaty, siti Halim, Nurfadhlina Abdul Haq, Fadiah Hasna Nadiatul Hidayana, Rizki Apriva Hutabarat, Aned Miranda Ibrahim, Riza Andrian Januaviani, Trisha Magdalena Adelheid Jauharie, Kaisar Shauma Rif’at Jumadil Saputra Kirani, Agnes Neisha Laksito, Grida Sakti Loei, Jonathan Melviana Mohamad Arief Setiawan Muhammad Rachman Mulyandi Musdaifah, Selvy Muyandi, Muhammad Rachman Nasria Nacong Natasha, Sharren Nikita Nugroho, Diyas Arya Nurnisaa AS Nurnisaa binti Abdullah Suhaimi Perdi Setiawan Persius, Angel Andromeda Pirdaus, Dede Irman Poluan, Regina Calista Pradana, Reza Septian Pratama, Wisnu Ramadhani, Sausan Riaman Riaman Rini Cahyandari Salih, Yasir Saudi, Jeremi Heryandi Setiawan, Mohamad Arief Setiawan, Perdi Shielline, Patricia Sidiq, Fahmi Sukono Sukono Sulistya A, Astrid Sulistya Azahra, Astrid Tanuwijaya, Terrance Tinambunan, Michael Tooy, Yohanes L. Trisna Insan Noor Vimelia, Willen Wangsa, Vanessa Wisesa, Krisna Yoga Wiwik Wiyanti Wulandari, Nuraeni Yoga, Vincensius Yuningsih, Siti Hadiaty Yuyun Hidayat