Portofolio Saham Optimal Menggunakan Single Index Model Pada Seluruh Kantor Sekuritas Di Kota Malang

Investment was the commitment of funds to one or more assets that would be held over some future time period.The goal of doing investment was to get the best return. Investment portfolio was one of the main considerationsto achieve the goal. This study aimed to establish the optimal stock portfolio using stock mutual fund productdata which was obtained from the survey results on securities office in Malang City in 2011 as a researchpopulation. Research method used was Single Index Model and data used were daily stock prices for 47 sharesin 2011. The results of this study indicated that there were twelve stocks in the optimal portfolio, namely:JKON, KAEF, TSPC, BKSL, BFIN, MAPI, KKGI, BHIT, CTRA, GGRM, MYOR. Based on the calculation, theresult was 76.71% for portfolio expected return and 7.23% for portfolio risk in 1 year

The Integration of ASEAN-5 Capital Market After the Donald Trump Election

Donald Trump's victory as the 45th President of the United States had negative responses on the ASEAN countries, especially on the stock market performance. This study conducted to investigate the existence of integration and contagion effect on the capital market of the ASEAN-5 countries after the election of Donald Trump. The five countries used in the research were Indonesia, Singapore, Malaysia, Thailand, and the Philippines. The five countries selected based on the highest FDI (foreign direct investment) flows among other ASEAN countries. Vector Error Correction models (VECM) and Granger Causality tests used as the analysis tools in the study. The daily closing stock price index of ASEAN-5 countries in 2016–2017 collected to be analyzed. The result of VECM model analysis and Granger causality test found the integration and contagion effect of the capital market in ASEAN-5 countries. The Granger Causality test showed that the Philippines had a contagion effect from other ASEAN-5 countries after the election of Donald Trump as the 45th President of the United States. In addition, it also found a two-way causal relationship between Singapore and Thailand, which showed that these two countries gave each other contagion effects.JEL Classification: G31, G32, G34DOI: https://doi.org/10.26905/jkdp.v22i4.199

The Correlation between the Use of Social Media and Academic Writing Mastery of the English Education Students

The objectives of this study were to find out: (1) the social media which is the most frequently used by the English Education Study Program students, (2) the correlation between the use of social media and academic writing mastery of the students, and (3) the contribution between the use of social media and academic writing mastery of the students. Thirty five students were chosen as the sample by using purposive sampling method. The data were collected through questionnaire and documentation. Pearson Product Moment Correlation Coefficient was used to analyze the obtained data. The result showed that there was a significant correlation between the use of social media and academic writing mastery of students of English education study program

The Competitive Advantage Between Intellectual Capital and Financial Performance of Banking Sector in ASEAN

This research aims to examine the mediating effect of competitive advantage in the relationship between intellectual capital and financial performance of the banking sector in five ASEAN countries. Furthermore, this research analyzes the differentiation level of intellectual capital using its components namely human capital, structural capital, and relational capital measured by Extended VAIC Plus (E-VAIC+). This research using partial least square method to test the mediation effect and ANOVA to test the differentiation level of intellectual capital on the banking sector in five ASEAN countries. The results show intellectual capital has a positive effect to financial performance and competitive advantage, competitive advantage has a positive effect to financial performance, and there is a different level of intellectual capital in Indonesia, Laos, Vietnam, Philippines, and Thailand. These findings support the resource-based theory which asserts that a unique set of resources that are owned and controlled can make the company have sustainable superior performance. These resources can be derived from the intellectual capital component that is exploited in such a way as a competitive advantage.JEL Classification: G31, G32, G34DOI: https://doi.org/10.26905/jkdp.v22i2.206

Effects of Position of Rainfed Rice Field in a Toposequence on Water Availability and Rice Yield in Central Java, Indonesia

The productivity of rainfed rice needs to be increased in order to support the Indonesian Food Security programs, especially rice. Rainfall is one of the main sources of the water availability on the rainfed rice field. This research was conducted from October 2000 to February 2001 at four sites in Central Java Province. The objectives of this research were to study thevariability of water availability that influenced by toposequen's position and to analyze the rice yields due to treatments on toposequence. This experiment was carried out in the farmers' field using “Group Balanced Block in Split-Split Plot Design” and Inceptisols soil order. Mainplots were the four positions in toposequence (top, upper middle, lower middle, and bottom), and the four villages were used as replication. The sub-plot wastreatments group and sub-sub-plot consists of group-1: farmer's practice and without weeding; group-2: farmer's practice without fertilizer and added recommended fertilizer. The research showed that rainfall affected the fluctuation of ground water table and standing water periods. The straw and unhulled rice/grain yields at the bottom position was the highest, and was significantly different from the top position of the toposequence, namely 7.1 and 5.6 t ha-1 for straw yield while 5.2 and 4.0 t ha-1 for grainyield. Without weeding, the straw and grain yields decreased by 1.0 t ha-1 (6.1 to 5.1 t ha-1) and 0.8 t ha-1 (4.6 to 3.8 t ha-1). While, without fertilization, the straw and grain yields were produced only 4.4 and 3.8 t ha-1. Straw and grain yields increased up to 7.0 and 5.1 t ha-1, respectively, when recommended fertilizers were applied

The Effects of Tropospheric Bias on Deformation Monitoring of MT. Guntur using GPS Survey Method

Pemantauan deformasi gunung api yang andal menuntut ketelitian yang tinggi, yaitu sampai level keteliatian mm untuk kasus gunung api yang tengah 'bangkit' kembali. Konsekuensinya adalah kesalahan dan bias yang dapat mengurangi ketelitian dalam penentuan posisi dengan satelit GPS harus dieliminasi dana tau direduksi, seperti kesalahan yang disebabkan oleh bias troposfer. Pada kasus pemantauan deformasi gunung api dengan metode survei GPS, karena adanya perbedaan tinggi yang cukup besar dan variatif antara titik-titik dalam jaringan, maka efek kesalahan bias troposfer tidak sepenuhnya dapat direduksi dengan proses pengurangan data (differencing). Residu (sisa) bias troposter ini harus dikoreksi agar tingkat keteliatian yang dituntut oleh sistem pemantauan deformasi gunung api dapat tetap tercapai. Pada makalah ini akan dibahas efek bias troposfer pada pemantauan deformasi gunung api. Pembahasan didasarkan pada hasil yang diperoleh dari pemantauan deformasi G. Guntur (Garut, Jawa Barat) dengan metode survei GPS. The Effects of Tropospheric Bias on Deformation Monitoring of MT. Guntur using GPS Survey MethodA reliable volcano deformation monitoring requires a high positioning accuracy, i.e. up to mm level in the case of reawakening volcanoes. As a consequence of this requirement, the errors and biases affecting the GPS positioning accuracy has to be eliminated or reduced, which one of them is the tropospheric bias. In the case of volcano deformation monitoring using the GPS survey method, due to a relatively large altitude variation in the stations altitude, the effects of tropospheric bias could not be effectively reduced by the differencing process. In order to meet the accuracy requirement of volcano deformation monitoring system, this residual tropospheric bias, therefore, has to be somehow corrected or taken into account. In this paper, the effects of tropospheric bias on the volcano deformation monitoring will be discussed. The discussion is based on the results from the deformation monitoring of Guntur volcano in Garut, West Java, by using repeated GPS surveys