低波动率量化策略的改进理论和实践
低波动率策略在投资组合中的重要性和改进理论
低波动性策略在投资组合管理中扮演着重要角色,它们因其在市场波动时提供稳定性而受到投资者的青睐。这些策略通过选择波动性较低的股票,可以减少投资组合的整体风险,同时在市场下跌时提供一定程度的保护。
然而,这些策略也存在一些潜在的缺点,如缺乏多样性、对其他风险因素的负面暴露,以及可能的行业和区域风险集中。
1. 多样化的缺失:低波动性策略可能会过度集中于某些股票,这可能导致投资组合的多样性不足。例如,逆波动性投资组合可能会给予低波动性股票过高的权重,而最小方差优化技术在没有适当限制的情况下也可能产生过度集中的投资组合。
2. 对其他风险因素的负面暴露:低波动性策略可能会无意中忽略了价值、动量、盈利质量和投资风险等其他对投资者有益的风险因素,这可能会影响投资组合的长期表现。
3. 行业和区域风险敞口:低波动性投资组合可能在某些行业或地区有过度的风险敞口,这可能会使投资组合对宏观经济风险更加敏感。
为了克服这些挑战,可以采取以下方法来构建更有效的低波动性投资组合:
– 引入权重约束:通过在优化过程中引入权重约束,可以确保投资组合不会过度集中在某些股票或行业上,从而提高多样性。
– 跨模型平均:使用多个优化模型并对其结果进行平均,可以减少对单一模型的依赖,从而降低模型风险。
– 规范权重约束:采用规范的权重约束,而不是基于样本的临时约束,可以更好地控制投资组合的集中度。
– 主成分分析(PCA):使用PCA等统计技术来处理协方差矩阵,有助于减少数据噪声,提高投资组合构建的准确性。
– 增加因子强度:在选择低波动性股票时,可以考虑其对其他奖励因子的风险敞口,选择那些对低波动性因子有正面暴露,同时对其他奖励因子也有正面或中性风险敞口的股票。
通过这些方法,投资者可以构建出更加多样化、风险调整后回报更高的低波动性投资组合,从而在追求稳定性的同时,也不失对其他潜在收益机会的把握。
每个有回报的因子都暴露在宏观经济因素中。当然,哪个因子对宏观经济风险的影响最大,将取决于宏观经济环境或制度。特定国家或地区的驱动因素解释了投资组合的大部分宏观风险,因此我们可以通过构建相对于上限加权基准在地理上保持中立的投资组合来减轻这一风险。由于宏观风险也通常是行业驱动的,因此在行业内选择低波动性股票可以减轻宏观风险。行业是重要的考虑因素,因为低波动性战略可能会超重对利率和其他形式风险敏感的特定行业,如公用事业。
低波动性股票投资组合可以成为投资者投资组合的宝贵补充。它们允许资产所有者即使在市场动荡中继续投资股票。然而,并非所有低波动性策略都是平等的。许多人缺乏防范集中和宏观风险所需的多样化和风险控制。
为此,这里概述的投资流程应用了各种措施,以确保必要的风险控制水平。在强调的两种技术中,第一种通过模型平均来减轻集中风险,第二种技术应用过滤器来剔除低因子强度库存。
通过部署这两种方法,同时寻找区域和行业风险,我们可以通过与标准低波动性基准相比的不同市场和宏观环境来促进多样化并降低投资组合的风险。
A股市场实践
不管是哪种指数增强策略,只要加上低波动率因子,就可以很好的解决回撤偏大的问题。同时对于不同行业和地域确实各种增强的其他因子不太一致,才能让回测结果比较好!
以下为回测结果,结果仅供参考!2021年以来最大回撤都做得相当优秀!
特定概念指数增强策略:

中证1000指数增强策略(剔除银行):

沪深300指数增强,银行的行业暴露比较大:

特定企业性质的增强策略(剔除了银行),一样可以获得比较好的回测结果:


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