Desimal: Jurnal Matematika

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ISSN / EISSN : 2613-9073 / 2613-9081
Total articles ≅ 94
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Subian Saidi, Ulfah Muharramah, La Zakaria, Yomi Mariska, Triyono Ruby
Desimal: Jurnal Matematika, Volume 3, pp 99-108; doi:10.24042/djm.v3i2.5871

Abstract:
The Lorenz curve is generally used to find out the inequality of income distribution. Mathematically a standard form of the Lorenz curve can be modified with the aim of simplicity of its symmetric analysis and calculation of the Gini coefficient that usually accompanies it. One way to modify the shape of the Lorenz curve without losing its characteristics but is simple in the analysis of geometric shapes is through a transformation (rotation). To be efficient and effective in computing and analyzing a Lorenz curve it is necessary to consider using computer software. In this article, in addition to describing the development of the concept of using transformations (rotations) of the standard Lorenz curve in an easy-to-do form, the symmetric analysis is also described by computational techniques using Mathematica® software. From the results of the application of the development of the concept of the Lorenz curve which is carried out on a data gives a simpler picture of the computational process with relatively similar computational results.
Zairisma Zairisma, Vina Apriliani, Johan Yunus
Desimal: Jurnal Matematika, Volume 3, pp 109-116; doi:10.24042/djm.v3i2.5751

Abstract:
The ability of mathematical representation is one of the abilities that must be possessed by students in learning mathematics. In fact, students 'mathematical representation ability is still relatively low, so we need a learning model that can improve students' mathematical representation abilities, namely Model Eliciting Activities (MEA) with STAD type. The purpose of this study is to compare the mathematical representation ability of students taught using MEA with STAD type and those taught with conventional learning. The approach to be used is a quantitative approach with a quasi-experimental research method and using a control group pretest-posttest design. The population in this study were all VII grade students. Sampling was done using simple random sampling, which consisted of two classes, class VII1 as the experimental class and class VII2 as the control class. Data collection is used by using a mathematical representation ability test sheet. The data analysis technique used is independent t-test. Based on these analysis it can be concluded that the mathematical representation ability of students taught using MEA with STAD type is better than conventional learning.
Rosida Yahya Asriyani, Isnaini Handayani, Windia Hadi
Desimal: Jurnal Matematika, Volume 3, pp 125-136; doi:10.24042/djm.v3i2.5728

Abstract:
This research was aimed to analyze student's errors on triangular and quadrilateral material in terms of problem-solving ability. This research was motivated by the low problem-solving ability and errors often made by students during the mathematics learning. The research approach was descriptive-qualitative that was done by analyzing the students' difficulty in solving description problems. The techniques of data collection were observation, learning outcomes tests, and interviews. The data were analyzed qualitatively based on Newman Error Analysis. Based on the results of the research, it was found that students' reading errors were in the high, medium, and low categories. Students' comprehension errors were in the medium and low categories, students' transformation errors were in the high, medium, and low categories, students' process skills errors were in the high, low, and medium categories and students writing errors (encoding error) were in the high, medium, and low categories.
Vera Mandailina, Syaharuddin Syaharuddin, Dewi Pramita, Malik Ibrahim, Habib Ratu Perwira Negara
Desimal: Jurnal Matematika, Volume 3, pp 155-160; doi:10.24042/djm.v3i2.6134

Abstract:
Some of the numeric methods for solutions of non-linear equations are taken from a derivative of the Taylor series, one of which is the Newton-Raphson method. However, this is not the only method for solving cases of non-linear equations. The purpose of the study is to compare the accuracy of several derivative methods of the Taylor series of both single order and two-order derivatives, namely Newton-Raphson method, Halley method, Olver method, Euler method, Chebyshev method, and Newton Midpoint Halley method. This research includes qualitative comparison types, where the simulation results of each method are described based on the comparison results. These six methods are simulated with the Wilkinson equation which is a 20-degree polynomial. The accuracy parameters used are the number of iterations, the roots of the equation, the function value f (x), and the error. Results showed that the Newton Midpoint Halley method was the most accurate method. This result is derived from the test starting point value of 0.5 to the equation root x = 1, completed in 3 iterations with a maximum error of 0.0001. The computational design and simulation of this iterative method which is a derivative of the two-order Taylor series is rarely found in college studies as it still rests on the Newton-Raphson method, so the results of this study can be recommended in future learning.
Putri Hotipah, Heni Pujiastuti
Desimal: Jurnal Matematika, Volume 3, pp 137-142; doi:10.24042/djm.v3i2.6118

Abstract:
This study was aimed to describe the students' mathematical connection ability in cube and cuboid learning materials based on gender differences. The research method employed was descriptive-qualitative. This research involved 6 subjects consisted of 3 males and 3 females students. Based on the results and discussion, it can be concluded that the total average score of male students was 54.5% and female students were 63.3%. Based on the categories of ability, male students were in a low category, while female students were in the moderate category. Several factors might cause this to happen, one of which was the low basic mathematical knowledge.
Nina Valentika
Desimal: Jurnal Matematika, Volume 3, pp 117-124; doi:10.24042/djm.v3i2.5939

Abstract:
This research examines Shopee consumers who have shopped at least once and are students in the Department of Accounting, Faculty of Economics, Pamulang University. The method used was the Structural Equation Modeling-Partial Least Square (SEM-PLS). The purpose of this research was to examine the direct effect of utilitarian values on satisfaction, examine the direct effect of satisfaction on loyalty, and examine the indirect effect of utilitarian values on loyalty. Based on the results of the research, it can be concluded that there was a significant influence on satisfaction and loyalty, utilitarian values, and satisfaction, as well as utilitarian values and loyalty. There was a significant influence of Utilitarian values and loyalty with satisfaction as an intervening variable.
Aji Raditya, Ratu Sarah Fauziah Iskandar, Suwarno Suwarno
Desimal: Jurnal Matematika, Volume 3, pp 89-98; doi:10.24042/djm.v3i2.5973

Abstract:
Mathematics textbooks have a significant role in mathematics teaching, and learning activities in schools and the questions contained in textbooks are usually used by students to practice independently. The purpose of this study is to analyze the types of problems in mathematics textbooks used from 2000 to 2017 in Indonesia, especially in the material of one-variable linear equations. The method used in this study is a six-dimensional analysis method, which consists of mathematical activities, the level of difficulty of the questions, the types of answers expected, contextual situations, the types of responses and the types of mathematical questions. Data collection techniques are done by analyzing and describing the types of questions in mathematics textbooks used from 2000 to 2017. The results of this study are the problems in mathematics textbooks for linear variable equations of one variable that do not have diverse types, the types of questions in textbooks are still many in the form of questions that calculate or use a variety of arithmetic operations, apply directly the basic knowledge or skills and without context in everyday life. Also, the existing questions are questions with closed answers, namely questions that only require answers without a reason and questions with a single procedure
Arisya Maulina Bowo, Iin Irianingsih, Budi Nurani Ruchjana
Desimal: Jurnal Matematika, Volume 3, pp 143-154; doi:10.24042/djm.v3i2.5870

Abstract:
Indonesia has a diversity of climate influenced by several global phenomena such as El Nino Southern Oscillation (ENSO), Indian Ocean Dipole (IOD), and Asian-Australian Monsoon. Continuously climate changing indirectly causes a hydrometeorological disaster. The purpose of this study was to analyze the relationship between global climate elements (ENSO, IOD, Asian-Australian Monsoon) with rainfall in the West Java regions (Bogor Regency, Bandung Regency, Sukabumi Regency, Garut Regency, and Kuningan Regency) simultaneously. The selection of the five regions was based on the natural disaster reports of Badan Nasional Penanggulangan Bencana (BNPB). The research method used was a quantitative research method through one of multivariate analysis technique called canonical correlation analysis. The results of this study indicate that there was a simultaneous relationship between global climate elements, with rainfall in the West Java regions by 0.819. The global climate element and rainfall in the West Java regions that most influenced the relationship were Asian-Austalian Monsoon and Kuningan Regency rainfall.
Netriwati Netriwati, Busmayaril Busmayaril
Desimal: Jurnal Matematika, Volume 3, pp 169-174; doi:10.24042/djm.v3i2.5212

Abstract:
Student Worksheet is a learning media that can be used as a guide for students and lecturers in the teaching and learning process. The developed product of this research is a website-based guided-inquiry approach student worksheet. The purpose of this study is to improve students’ learning outcomes and motivation in learning mathematics. This research employed the pre-experimental method with one-group pretest-posttest design. The small-scale testing obtained an average score of 3.1 which is included in the interesting category. The large-scale testing obtained an average score of 3.26 which is included in the very interesting category. The website-based guided-inquiry approach student worksheet obtained an average score of 0.48 which is included in the medium category for its effectiveness. It can be concluded that the website-based guided-inquiry approach student worksheet is feasible and very interesting to be used in increasing student motivation and learning outcomes for better learning in Basic Mathematics course.
Melkior Wewe
Desimal: Jurnal Matematika, Volume 3, pp 161-168; doi:10.24042/djm.v3i2.6421

Abstract:
This research was conducted because of the low students’ learning outcomes in concepts mastery in calculus course. The purpose of this research was to obtain the concepts mastery profile of the second semester students of the Mathematics Education Study Program. The results obtained in this study were used as reference materials for calculus course and to influence the lecturers to find the right approach or learning model in order to improve students’ concept mastery. This study employed the descriptive-quantitative method. The results showed that the students' were having learning difficulties in concepts mastery in calculus course. The learning difficulties were caused by low concepts mastery and low mathematical principles understanding that led the students into wrong process skills. The difficulties experienced by the students such as difficulties in understanding the concepts and principles of the absolute value of the material, limit functions, and derivatives so that their answers were not as expected.
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