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Boosting类算法比较研究——以线上优惠券回收情况预测为例
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作者 翟大昆 牟文龙 《软件》 2021年第10期67-69,共3页
作为集成学习的重要组成部分,Boosting类算法目前在机器学习领域受到广泛的关注。为了对Boosting类算法的性能进行比较分析,本文以线上优惠券回收预测模型的研究为例,对比Adaboost、GBDT、XGBoost三种主流Boosting算法在该分类问题上的... 作为集成学习的重要组成部分,Boosting类算法目前在机器学习领域受到广泛的关注。为了对Boosting类算法的性能进行比较分析,本文以线上优惠券回收预测模型的研究为例,对比Adaboost、GBDT、XGBoost三种主流Boosting算法在该分类问题上的拟合效果。并在其中选取拟合效果最好的算法代表Boosting类算法,与传统机器学习模型的拟合效果进行对比分析。最终发现XGBoost在线上优惠券回收预测模型中的表现优于另外两种算法。 展开更多
关键词 性能分析 线上优惠券回收预测模型 Boosting类算法 极限梯度提升算法
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机床再制造逆向物流的预测建模方法研究 被引量:3
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作者 芮维娜 毛海军 +1 位作者 李旭宏 何杰 《中国制造业信息化(学术版)》 2006年第3期58-62,66,共6页
为机械制造企业实施旧机床再制造提供了一种用于预测旧产品回收水平(回收数量和回收时间)的有效方法。该方法以影响旧产品回收的相关因素为基础,利用模糊逻辑推理系统构建模型,并通过一个实际案例的应用评估了模型的合理性和实用性。
关键词 机床再制造 逆向物流 回收预测模型 模糊推理系统
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Risk-Neutral Dynamic of Forward-Looking Default Probabilities and Recovery Rates: Evidence From Credit Default Swap Prices of DOW30 Companies
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作者 Chavalit Kitjakarnlertudom Sira Suchintabandid 《Chinese Business Review》 2011年第10期811-843,共33页
In modem financial markets, the credit default swap (CDS) market has supplanted the bond market as the industry gauge for a borrower's credit quality. Therefore, it is very important to value CDS accurately by gett... In modem financial markets, the credit default swap (CDS) market has supplanted the bond market as the industry gauge for a borrower's credit quality. Therefore, it is very important to value CDS accurately by getting closer to more realistic pricing models. So far there have been no models for extracting forward-looking credit information to value CDS. In current practice, historical data is used in a credit default swap pricing model. One of the reasons was the difficulty when the market for credit derivatives was small, to extract forward-looking credit information such as recovery rates and default probabilities from traded securities. Since the CDS market has undergone rapid expansion in recent years, the possibilities of extracting forward-looking credit information have increased. Our work significantly extends Das and Hanouma (2009) where a flexible jump-to-default model was introduced to obtain implied recovery rates. We improve the flexible jump-to-default model where forecasted forward-looking hazard rates and recovery rates can be extracted using stock prices, stock volatilities and data from credit default markets to forecast CDS spreads. Instead of using exogenously assumed constant recovery rates and default probabilities from a credit rating agency, we use forward-looking hazard rates and recovery rates to price and forecast CDS spreads. We also compare out-of-sample market CDS spreads with our forecasted CDS spreads to check how well our model performs. Our model fit the market CDS spreads very well across all time to maturity CDS contracts except in some extreme cases when there is a big jump in CDS spreads. 展开更多
关键词 financial derivatives derivatives pricing credit default swaps
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