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All Journal Diponegoro Journal of Management Oseanologia
Maharani, Ema
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Decision Sciences, Operations Research & Management Earth & Planetary Sciences

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ANALISIS PENGARUH MOMENTUM, TRADING VOLUME DAN SIZE TERHADAP DISPOSITION EFFECT DAN RETURN APLIKASI CROSS SECTIONAL REGRESSION (Studi pada Indeks Saham Kompas 100 Tahun 2012-2015) Maharani, Ema; Arfianto, Erman Denny
Diponegoro Journal of Management Volume 6, Nomor 1, Tahun 2017
Publisher : Faculty of Economics and Business Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (456.763 KB)

Abstract

Momentum and disposition effect in modern stock markets are distractions against the Efficient Market Hypothesis. The effect might be elaborated by disposition effect model in which momentum is explored through behavioral bias. The aim of this research was to analyze the propensity of previously winning-stock to perform better than losing-stock as a strategy of momentum attributable to disposition effect. The study case incorporated Stock Index of Kompas 100 in Indonesia Stock Exchange during the period of 2012–2015 by employing cross sectional regression.Weekly stock data from 79 companies were taken as sample--comprising of volume and outstanding share. The variables consist of momentum in the sort-term, medium-term, and long term; consecutively taken from past-return week-1, past-return week 5 to 52, past return week 52 to 156. Additionally, to examine the size, trading volume variables were used consisting of average trading volume in the sort-term, medium-term, and long term; consecutively taken from week 1 to 4, 5 to 52, and 53 to 156.Capital gains overhang were used as a proxy of disposition effect. The results revealed that momentum exists on Indonesia Stock Exchange; furthermore, capital gains overhang is sufficient to be a proxy of disposition effect. In other words, disposition effect is driven by momentum. Up to the point od this study, Indeks Stock Kompas 100 has experienced a capital losses; implicating an inclination to remain perform satisfactorily ahead.
Karakteristik Morfologi Dan Komposisi Ukuran Gastropoda Ellobiidae Di Ekosistem Mangrove Desa Sungai Bakau Kecil Kalimantan Barat Maharani, Ema; Safitri, Ikha; Sofiana, Mega Sari Juane
Oseanologia Vol 3, No 3 (2024): Desember
Publisher : Program Studi Ilmu Kelautan FMIPA Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jose.v3i3.87642

Abstract

Kalimantan Barat memiliki ekosistem mangrove yang luas di beberapa area pesisir, termasuk di Kabupaten Mempawah. Salah satu desa di kabupaten ini adalah Desa Sungai Bakau Kecil, yang luas wilayahnya sekitar 16,95 km ². Penelitian ini mengkaji karakteristik morfologi dan komposisi ukuran gastropoda dari famili Ellobiidae di ekosistem mangrove Desa Sungai Bakau Kecil, Kalimantan Barat. Ekosistem mangrove ini berfungsi sebagai habitat penting bagi beragam biota, termasuk gastropoda, yang berperan sebagai indikator kesehatan lingkungan. Penelitian ini dilakukan pada bulan agustus 2024 di kawasan mangrove Desa Sungai Bakau Kecil, Kalimantan Barat. Sampel diambil menggunakan metode simple random sampling pada wilayah yang memiliki komunitas gastropoda dan dianalisis di laboratorium untuk identifikasi spesies dan pengukuran morfometrik. Hasil identifikasi menunjukkan keberadaan tiga spesies, yaitu Cassidula aurisfelis, Cassidula nucleus, dan Ellobium aurisjudae. Ketiga spesies ini menunjukkan variasi ukuran cangkang yang mencerminkan adaptasi mereka terhadap kondisi lingkungan. C. aurisfelis dan C. nucleus dominan di permukaan substrat dan akar mangrove (epifauna dan treefauna), sedangkan E. aurisjudae lebih sering ditemukan di substrat berlumpur. Distribusi ukuran yang seimbang pada ketiga spesies ini menunjukkan stabilitas ekologis ekosistem mangrove. Temuan ini menyoroti pentingnya gastropoda Ellobiidae sebagai indikator kesehatan ekosistem mangrove serta kontribusinya terhadap struktur komunitas mangrove.
Co-Authors Erman Denny Arfianto Ikha Safitri Mega Sari Juane Sofiana