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Desimal: Jurnal Matematika
Published by Universitas Islam Negeri Raden Intan Lampung
ISSN : 26139073     EISSN : 26139081     DOI : -
Core Subject : Education, Social,
Education Mathematics Social Sciences
Desimal: Jurnal Matematika, particularly focuses on the main issues in the development of the sciences of mathematics education, mathematics education, and applied mathematics. Desimal: Jurnal Matematika published three times a year, the period from January to April, May to Augustus, and September to December. This publication is available online via open access.
Arjuna Subject : -
Articles 330 Documents
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ARIMA-GARCH Markov switching method for forecasting the share price of PT. Bank Rakyat Indonesia (Persero) Tbk. Afida, Hilda Nurlaila; Ahdika, Atina
Desimal: Jurnal Matematika Vol. 7 No. 2 (2024): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v7i2.22151

Abstract

Shares are financial instruments that represent a small ownership in a company and give the holder the right to receive dividends and participate in the company’s decisions. The Covid-19 pandemic is also believed to have a major impact on the world stock market, so it is also important to analyze stock price fluctuations before and after the outbreak. One of the suitable methods for predicting stock price volatility is ARIMA-GARCH Markov Switching. The data used is secondary data from PT. Bank Rakyat Indonesia (PERSERO) Tbk. From January 2, 2019 to November 30, 2023. PT stock price data forecast. Bank Rakyat Indonesia (PERSERO) Tbk. Using ARIMA-GARCH Markov Switching method, the best model is ARIMA(2,1,2) GARCH(1,1) and the forecast value obtained is 5280.935; 5275.403; 5276.776; 5279.255; 5275,760 for 5 periods and divided into 2 regimes, namely the first regime with data that has low volatility and the second regime with data that has high volatility.
The effect of problem based learning on students' mathematical literacy ability Andini, Fadhila Andini; Siregar, Machrani Adi Putri
Desimal: Jurnal Matematika Vol. 7 No. 1 (2024): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v7i1.22211

Abstract

This research is motivated by the many problems that often arise during learning in the classroom, especially mathematics. The purpose of this study was to determine how the description of students' abilities and problems in learning mathematics about relations and functions is taught using problem-based learning models and conventional learning models. With a post-test-only control group design, this research is quasi-experimental. Based on the results of data analysis obtained sig. (2-tailed) of 0.000 <0.05. Therefore, it can be concluded that Problem Based Learning and conventional learning produce significantly different levels of mathematical literacy. The practical implication of this study is that educational practitioners, particularly mathematics teachers at the junior high school level, can utilize these findings to improve their teaching. PBL can be used as a basis for designing more innovative and student-centered learning units, which can help students develop a deeper understanding of mathematical concepts and improve their ability to solve problems. Adequate support and training for teachers in implementing PBL is also important to ensure its successful implementation in the classroom.
Analysis of the mathematical literacy skills of high school students in solving PISA questions content change and relationship viewed from self-esteem Cahyani, Rimma Regita; Khotimah, Rita Pramujiyanti
Desimal: Jurnal Matematika Vol. 7 No. 2 (2024): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v7i2.22261

Abstract

Mathematical literacy is a person's ability to use mathematical science that includes aspects of understanding, application, reasoning, and communication in everyday life. This study aims to analyze and describe students' mathematical literacy in solving questions about changes in PISA content and the relationship that students' self-esteem checks. This research uses qualitative descriptive research methods. The subjects of the study consisted of three Class IX.2 students at Negeri 3 Secondary School Surakarta. Data collection techniques consisted of PISA self-esteem improvement, content change and relationship tests, and interviews. Data analysis techniques consist of data presentation, data reduction, and conclusions. The results of the study show that students with high self-esteem can meet the six indicators of mathematical literacy in both subjects.
Autoregressive neural network (AR-NN) modeling to predict the inflation rate in West Java Province Zahra, Nabila; Parmikanti, Kankan; Ruchjana, Budi Nurani
Desimal: Jurnal Matematika Vol. 7 No. 2 (2024): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v7i2.22626

Abstract

The Autoregressive (AR) model describes the situation where the data in the current observation of a time series depends on the previous observation data. AR models have linearity assumptions. However, in reality there is a non-linear tendency in the data so it needs to be combined with a Neural Network (NN) model. NN models can overcome nonlinear problems in data. The purpose of this research is to build an AR-NN model and apply it to the inflation rate data of West Java Province. The result of this study is an AR(2)-NN model generated by summing the AR(2) prediction results with the residual AR(2) prediction results using a NN model that has a network architecture (4-5-1). The results of data processing show that the AR(2)-NN model is able to increase the level of forecast accuracy from a reasonable forecast to an accurate forecast so that the AR(2)-NN model is better used in West Java Province inflation rate data. This is supported by the smaller MAPE values compared to the AR(2) model. The AR-NN model is expected to be a recommendation for predicting inflation rates in the future.
Problem-solving analysis in solving HOTS problems judging from self-confidence Azzahra, Luthfia; Nurhanurawati, Nurhanurawati
Desimal: Jurnal Matematika Vol. 7 No. 2 (2024): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v7i2.22675

Abstract

This study analyzes the process of solving students' mathematical problems based on Polya's level and self-confidence. This research is a type of qualitative research with a case study approach. The subjects used in this study consisted of three students representing the level of confidence. Data collection in this study was conducted using triangulation techniques, which included tests, non-tests, and interviews. The results of the study were obtained based on the Polya level: Students with a high level of confidence will understand the problem clearly, plan steps to solve it, implement the solution plan, and check the results obtained. Students with moderate confidence only understand the problem clearly and plan the solution steps. Students with low self-confidence can only meet a few levels of Polya. Therefore, students with a high level of confidence do not hesitate and maximize their potential in solving problems so that they can solve them.
The influence of the problem based instruction learning model on reasoning ability and mathematics learning outcomes on the system of linear equations with two variables Nasution, Juwita Andriani; Harahap, Amin; Pasaribu, Laili Habibah
Desimal: Jurnal Matematika Vol. 7 No. 2 (2024): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v7i2.22954

Abstract

This study aims to see the influence of the problem-based teaching learning model on reasoning abilities and the results of mathematical learning in the materials of the two-variable linear equation system in class X of SMK Swasta Dewi Sartika Bilah. This research is quantitative research with a Quasi-experimental approach using a Pre-Test-Post-Test Control Group Design research design. The population in this study is all students of class X which consists of 3 classes namely X-TBSM, X-TKJ, While the sample in this study is class X-TKJ which consists of 30 students as an experimental class, and class X-OTKP. consisting of 30 students as a control class with a sampling technique that is Simple Random Sampling. The data collection technique used in this research is a test to obtain data on mathematical reasoning abilities and mathematical learning outcomes. The results of the data analysis process prove that there is a significant influence with the application of the problem-based teaching learning model on reasoning abilities and the results of mathematical learning in the materials of the two-variable linear equation system.
The effect of classroom management using the visual auditory kinesthetic learning model on mathematics learning outcomes on the material of a system of linear equations of two variables Kemri, Tiara Widia; Hasibuan, Lily Rohanita; Siregar, Sakinah Ubudiyah
Desimal: Jurnal Matematika Vol. 7 No. 2 (2024): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v7i2.22983

Abstract

This study aims to find out the effect of the implementation of classroom management with the Visual, Auditory and Kinesthetic learning model (VAK) on the results of students' mathematics learning on the material system of linear equations of two variables (SPLDV) in SMPN 2 Rantau Selatan. This study used a quasi-experimental type of research with a pretest-posttest control group design. Data were collected through closed questionnaires and test questions in the form of pre-test and post-test each of which totaled 5 questions for each test—data analysis technique using multiple linear regression analysis technique. The results of the study show that the application of classroom management and the VAK learning model individually and together has a positive and significant effect on students' mathematics learning outcomes. The contribution of classroom management and the VAK learning model explains about 73.6% of the variation in student mathematics learning outcomes, according to the coefficient of determination (Adj R2 ) of 0.736. While the rest is influenced by other variables that are not examined by the researcher. This study concludes that classroom management using visual, auditory, and kinesthetic learning models affects students' mathematics learning outcomes, especially in the context of SPLDV. The implications of these findings guide educational practitioners in improving the effectiveness of mathematics learning in schools.
Efforts to increase students' interest in learning through the learning media of number cards with whole numbers in addition and subtract Hijrah, Nurul; Hasibuan, Lily Rohanita; Julyanti, Eva
Desimal: Jurnal Matematika Vol. 7 No. 2 (2024): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v7i2.23113

Abstract

This study aims to increase students' interest in mathematics. Students can use number card learning media as an alternative method of learning integers (addition and subtraction). In mathematics, the material on integers (addition and subtraction) discusses abstract properties in mathematics. Based on this study, the study was conducted through observation of class VII students at MTs Altihadul Wathoniayah. This research takes the type of quantitative research through an experimental approach and uses a Pretest-Posttest Design. This research involves all class VII MTs Al Ittihadul Wathoniyah, both class VII-A and VII-B. However, the sample used randomly is type VII-A which consists of 30 samples used in this study to conduct tests to collect data on reasoning skills and mathematics learning outcomes. After testing with the hypothesis that the calculated value is greater than the table's t value. The results of the data show that the use of number cards in conducting research on mathematics learning media is effective in increasing students' interest in learning mathematics subjects and achieving satisfactory results.
Bayesian spatial data analysis: Application of pneumonia spread in west java Habsy, Muhammad Yusuf Al; Husein, Fulkan Kafilah Al; Yahya, Muhammad Harun; Rachmawati, Ro'fah Nur
Desimal: Jurnal Matematika Vol. 7 No. 1 (2024): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v7i1.23154

Abstract

Pneumonia has a notable influence on public health, especially among susceptible demographics like children and the elderly. This respiratory disease can be transmitted through human interaction. Analyzing the spread of the illness within a community requires assessing the characteristics of the community itself. The objective of this research is to describe the distribution of pneumonia cases and their causes in the West Java Province using RStudio software. The analytical method employed is the Integrated Nested Laplace Approximations (INLA) approach, a Bayesian statistical method used for estimation in complex Bayesian models, particularly in hierarchical or nested structure. The sample utilized comprises the entire population, totaling 27 Districts/Cities within West Java Province. The influence of differences in population size, number of people living in poverty, waste production, the quantity of primary healthcare facilities, total number of vehicles, and the count of HIV patients in Cities/Regencies in West Java on the spread of pneumonia will be analyzed. The result of analysis show that the population and number of health centers variables had a significant influence on the mapping of pneumonia disease in each location. And also, the Relative Risk (RR) and Standardized Incidence Ratio (SIR) maps show that some regions have a higher risk of pneumonia compared to other regions. These findings are expected to provide insights for public policies in addressing health issues, particularly in the efforts to prevent and control diseases like pneumonia. Moreover, these results serve as a foundation for further studies regarding other factors that might contribute to the spread of this disease at the local level.
Development Of E-LKPD hots questions as a medium for learning mathematics on the material of the Phytagorean theorem Nuraisyah, Nuraisyah; Pasaribu, Laili Habibah; Julyanti, Eva
Desimal: Jurnal Matematika Vol. 7 No. 2 (2024): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v7i2.23163

Abstract

Learning in the modern era demands learning based on KBAT, literacy skills, character education, and 4C (critical, creative, collaborative, and collaborative), all of which can be achieved through the development of E-LKPD based on KBAT combined with critical thinking skills indicators. The purpose of this study is to produce an E-LKPD product using KBAT-based questions, to determine whether the KBAT-based E-LKPD is suitable for the material of the Pythagoras theorem, and to determine the student's reaction to the created KBAT-based E-LKPD. . This refers to the ADDIE model. This study involves eighth grade students of SMP N 2 Utara Province who are the subject of this study and the object of this study is E-LKPD using KBAT based questions. Student questionnaires and confirmation sheets were used in this study. This study obtained the results which are: (1) The feasibility of E-LKPD using KBAT-based questions by media experts is in the feasible category (80.00) and material experts are also in the feasible category (77.5); and (2) Student response to E-LKPD using KBAT-based questions is in the good category with an average of 81.1%. Thus, this study shows that E-LKPD using KBAT-based questions can be used as media in the learning and teaching process.

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