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Adina Astasia
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Interpolasi Konsentrasi Polutan Timbal di DKI Jakarta Menggunakan Kriging Bayesian Adina Astasia; Pardomuan Sihombing
Jurnal Statistika dan Aplikasinya Vol 4 No 1 (2020): Jurnal Statistika dan Aplikasinya
Publisher : Program Studi Statistika FMIPA UNJ

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JSA.04101

Abstract

Jakarta merupakan salah satu kota paling tercemar di Asia Tenggara. Pertumbuhan polusi di Jakarta pun cukup tinggi seiring dengan pertumbuhan volume kendaraan bermotor. Salah satu zat pencemar yang berbahaya sebagai hasil pembakaran tidak sempurna mesin kendaraan adalah Timbal (Pb). Timbal berbahaya bagi kesehatan terutama pada anak-anak dan ibu hamil. Mengingat pentingnya pengukuran kualitas udara, termasuk Timbal (Pb) maka BPLHD (Badan Pengelola Lingkungan Hidup Daerah) Provinsi DKI Jakarta melakukan pemeriksaan kualitas udara secara berkala agar dapat menjamin kualitas udara di Jakarta. Namun, mahalnya biaya pemantauan kualitas udara ini menyebabkan kualitas udara hanya diukur pada beberapa titik lokasi pengamatan. Oleh karena itu, makalah ini bertujuan untuk melakukan interpolasi kualitas udara pada titik-titik yang tidak tersampel menggunakan teknik interpolasi spasial atau kriging. Kriging dilakukan dengan metode Bayesian untuk mempertimbangkan ketidakpastian parameter dalam variogram. Hasil penelitian menunjukkan Jakarta bagian barat berpotensi memiliki polutan timbal yang tinggi dibandingkan wilayah pusat dan timur. Selain itu, dilakukan perbandingan antara metode kriging konvensional dan bayesian, dengan hasil kriging bayesian memiliki varians yang lebih kecil dibandingkan kriging konvensional.
Analisis Pengaruh Kebijakan Bank Konvensional terhadap Tingkat Keuntungan Bank Syariah Adina Astasia; You Ari Faeni
Jurnal Ekonomi dan Pembangunan Vol. 29 No. 1 (2021): Jurnal Ekonomi dan Pembangunan
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/JEP.29.1.2021.81-91

Abstract

The development of Islamic banking in Indonesia had been very rapid in recent years. However, the market share of Islamic banking was still far below expectations. Previous theoretical studies had stated that the competitive environment between conventional banks and Islamic banks, greatly affected the performance of Islamic banks. In this study, we tried to understand how the influence of conventional bank policies which was described by the savings interest rate (SB) towards the profits of Islamic banks described by Return on Assets (ROA). The analysis method used was Vector Autoregressive (VAR) with additional analysis of Impulse Response Function (IRF) and Variance Decomposition Analysis (VDC). The results of the analysis using VAR stated that there was a significant negative effect on Islamic bank profits (ROA) if there was a shock to conventional bank interest rates (SB). This condition was in line with the results of research by Haron and Ahmad (2000); Haron (2004), and Zainol and Kassim (2012) which suggests that if the interest rate for conventional bank savings increases, Islamic bank customers would switch to conventional banks which were considered to provide greater profits, so that the bank’s profits will increase, so that the profit of Islamic banks had decreased. These results indicated that not all Islamic bank consumers were loyal consumers, Islamic banking was required to act rationally, namely by setting a competitive profit sharing rate against conventional bank interest rates.
Co-Authors Pardomuan Robinson Sihombing You Ari Faeni