Browsing by Author "Ming-Chang Wang"
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Item type:Item, Adjusting Minimal Maintenance Margin Requirement When Price Limits Widening(2014) ;王明昌 ;鄭揚耀 ;陳宥榤 ;Ming-Chang WangLee-Young Cheng本研究昌在探討台股放寬漲跌幅限制時,現行信用交易的整戶擔保維持率是否需要調整以確保授信機構的債權。本研究藉GARJI模型估計風險值,推估不同漲跌幅之最低擔保維持率臨界值,再以最低擔保維持率的上限值為基準,利用台股過去不同信心水準、風險程度、模擬投資人的投資組合,推估放寬漲跌幅時最低擔保維持率臨界值,同時以保障條數比較台指期與證券信用交易。實證結果發現:漲跌幅放寬為10%時,現行法定最低擔保維率120%對授信機構之債權保障可能有些微不足;另一方面,即時性的證券市場之信用交易保障程度是近似於期貨市場。本研究結果提供政策制定者,於價格限制放寬時,對信用交易有關整戶擔保維持率提供最適設定。Item type:Item, Effects of individual margin requirement and risk preference on individual margin trading(交通大學, 2016-06-01) ;Ming-Chang Wang ;Lee-Young ChengPang-Ying ChouUsing a total of 25,000 individual accounts provided by the Taiwan Stock Exchange Corporation, this paper discusses the methodologies used for securities margin trading and explores whether a difference in the individual margin requirements and risk preferences set by investors would change the securities margin trading ratio. The individual margin requirements set by investors depending on the degree of leverage regarding investment targets. And, the margin trading ratios set by investors depending on the size of their leveraged positions. Therefore, investors can adjust the risks associated with investment portfolios according to the degree of leverage and leveraged positions. In addition, because the degree of risk aversion exhibited by individual investors varied, the investment portfolio risks differed. This study explores whether risk preference influences the relationship between the individual margin requirement set by investors and the margin trading ratio they adopt. The empirical results indicate that the investors adopt a low margin trading ratio when they set a high individual margin requirement. The trading mechanism for individual margin requirements can reduce volatility effects and mitigate the influences exerted on individual margin trading. Moreover, a low degree of risk preference increases the sensitivity of individual margin requirements toward individual margin trading.Item type:Item, Rationality of the personal loan interest-rate markups of banks(交通大學, 2017-06-01) ;Ming-Chang Wang ;Sung-Shan ChenJen-Min ChiangThis study provides a model of banks' personal loan interest-rate markups by analyzing their expected profit maximization. Employing 804 personal loan cases from one Taiwanese bank, our empirical findings show that this model is able to identify the personal loan interest cut-off rates for each risk segment for bank profit maximization in order to determine personal loan interest-rate markups in a more accurate and rational manner. The interest-rate markups identified by this model can serve as a reference for banks' projections regarding optimal interest-rate markups for personal loans.Item type:Item, 市場恐慌情緒對台股新聞事件之股價反應的影響(國立陽明交通大學經營管理研究所, 2022-04-01) ;王明昌 ;許婉琪 ;李飛涵 ;柯建全Ming-Chang Wang本文試圖探討市場投資人情緒變動是否對於台灣股市在好、壞新聞的股價反應有產生增額的效果。以台灣上市公司1997至2010年期間之台灣50成份股公司的新聞及股價為訓練樣本,再以2011年1月1日至2020年8月10日期間之新聞事件作為檢定樣本,並以CBOE建立之恐慌指數(volatility index, VIX)作為投資人情緒,研究恐慌指數(VIX)變動時對好、壞新聞之股價報酬反應之影響。本文實證結果:(一)壞新聞發佈對事件超額報酬率具顯著負相關。(二)好新聞發佈對事件超額報酬率具顯著正相關。(三)以七日事件累積超額報酬率觀察,壞新聞與恐慌指數變動交乘項後,持續累積第5日開始呈顯著負相關;好新聞則不相關,代表市場恐慌指數(VIX)變動對好、壞新聞具有不對稱的股價反應。(四)進行中介效果分析中,證實新聞對股價報酬率的影響與市場情緒變動有關,投資人情緒會影響股價報酬率表現。在考慮市場系統性風險後,當市場瀰漫投資人恐慌情緒時,投資人對壞新聞更為敏感而導致股價下跌幅度加深;好新聞則不會有額外的情緒反應,形成好、壞新聞產生不對稱反應。Item type:Item, 應用卷積神經網路辨識股票K線影像改善投資組合策略之研究(國立陽明交通大學經營管理研究所, 2023-04-01) ;王明昌 ;丁裕家 ;陳詩婷 ;Ming-Chang WangYu-Jia Ding本研究透過卷積神經網路(CNN)模型進行K線影像預測股票報酬率與成交量,並藉由交乘比較分析以驗證投資組合績效。研究對象為2010年至2017年之台灣上市公司,區分前、後四年為訓練期及測試期進行投資組合實證分析,將股票K線圖之開盤價、最高價、最低價和收盤價等時間序列資料轉換為二維圖像資料,利用深度學習之卷積神經網路的圖形辨識能力,進行特徵分類以預測股價報酬率及成交量。根據模型預測出之報酬率與成交量組別所分類的股票建構投資組合,並以Fama and French(1993)三因子模型及Carhart(1997)四因子模型檢定是否具有顯著超額報酬。實證結果發現前期實際成交量與K線圖形預測報酬率組別所分類的股票建構投資組合可獲得超額報酬,推論以K線影像建構投資組合時必須考慮成交量,將有助於提升投資組合超額報酬的能力。本研究驗證深度學習技術應用於投資策略的可行性,可作為市場參與者投資決策之參考依據。