For partitioning the dataset of financial ratios into abnormal and normal groups, this paper proposes a hybrid clustering technique by combining similarity matching (SM) algorithm with self-organizing maps (SOM), called SM-SOM technique. The hybrid system provides three stages: preprocessing stage, similarity matching with cosine algorithm and SOM cluster. For evaluating the performance of this...

While studies in other industries suggest that firm type, firm size, and time are important factors that explain the cross-sectional variations in abnormal stock market returns, studies in the area of IS security are inconclusive. In this study, we examine whether the characteristics of the incident – Attacker type, attacker’s objective, results of the attack, attack tools and access type influ...

This research aims to determine whether there are differences in stock prices, returns and abnormal before after a split high profile low companies. The period used this study was on 2016-2018. analyzed quantitative method by using purposive sampling method. Based the criteria, 40 companies were selected as samples. Kolmogorov Smirnov One Sample test for normality test. After carried out, data ...

objective : this study aimed to review papanicolaou (pap) smears in patients of shohada hospital in tehran. materials and methods :  a cross-sectional descriptive study was carried out and a database search of all pap smear reports from 1995 to 2005 at cytopathology department was reviewed. the abnormal pap smear reports based on the bethesda system were assessed. results : a total of 13315 pap...

In early 2020, stock trading in Indonesia was under significant pressure, as indicated by the decline IHSG. This is due to pressure and global economic slowdown Covid-19 pandemic weakening world oil prices. The purpose of this study find out how effect share buyback announcements without RUPS on response market at PT. Aneka Tambang Tbk. based Surat Edaran OJK Nomor 3/SEOJK.04/2020. research str...

Abstract This paper examines whether adding expected dividend yields implied by analyst forecasts to capital gains target prices improves the portfolio strategy of buying stocks with highest returns and selling lowest returns. We find that based on total performs only slightly better at 1-month horizon because short-term return predictability yield is weak. generates significant abnormal regard...

The announcement of the Luxury Goods Value Added Tax Incentive policy (PPnBM) is an economic phenomenon that used in studying capital market reactions. research aims to empirically examine whether or not there a significant abnormal return and trading volume activity before after PPnBM policy. This type event study using quantitative approach. sample was selected by purposive sampling method, n...

background: during the month of ramadan, millions of muslims abstain from food and drink daily from dawn to sunset and people actually experience repeated cycles of fasting and refeeding. menstruation is a normal physiological process that its regularity is controlled by hypothalamic-pituitary-ovarian axis. etiology of menstrual dysfunction includes weight loss, hypoleptinemia, abnormal eating ...

Abstract We examine how abnormal returns and return determinants change when a company is added to S&P 500. Newly companies experience significant increase in around the announcement addition dates. This accompanied by an improvement liquidity decrease associated shadow cost. While before their addition, firm-specific can be explained price impact, they are changes trading activity during e...

One of the main concerns of investors is the evaluation of the return on investment, which is conducted using various models such as the CAPM (single-factor model), Fama-French three/five-factor models, and Roy and Shijin’s six-factor model and other models known as multi-factor models. Despite the widespread use of these models, their major drawbacks include sensitivity to unexpected changes, ...