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华安基金牛勇:投资要有“中心轴”

2017-09-18 07:01:38   中国经济网

⊙记者 朱贤佳 ○编辑 金苹苹

“投资和打太极是相通的,一定要有中心轴,不能过分偏离。这个"中心轴"在很大程度上就是基本面因子。”这是采访中牛勇给记者留下印象最深的一句话。

牛勇身兼数职,既是华安沪深300量化增强基金经理,又是华安基金指数与量化投资事业部助理总监。回顾其今年以来的投资业绩,在沪深300指数整体呈区间波动的市况下,截至9月7日,在指数量化增强基金中,华安沪深300量化增强基金今年以来累计上涨27.13%,高出同行业11.11%的平均收益,大幅领先同类产品排名。究其原因,今年价值股和白马股持续受到资金追捧,从基本面角度出发选股的该量化基金在兼顾风险与收益方面有较大优势。

投资和太极有异曲同工之处

有着深厚数学功底的牛勇,平时喜欢打太极拳。他说,自己从太极中悟出了投资的真谛。“投资和太极一样是有一条中心轴的,过分偏离就会走型。”牛勇如是说。

谈及量化组合,他的话匣子一下子打开了。据他介绍,当前市场上比较主流的量化基金选股方法为多因子量化选股模型,因子主要包括以下三类:基本面因子、和市场交易特征相关的技术因子、体现流动性的因子。其中,基本面因子被牛勇视为能为组合创造稳定收益的重要来源。无论是量化基金还是主动管理基金,重视基本面的价值投资始终是“中心轴”。牛勇对记者表示,打太极的轴就是人的身体,而投资的轴就是基本面。

他进一步解释了组合中不同因子的特点和对组合的贡献程度:“在量化组合中,我们把因子大致分成两类:一类是风险因子,特征比较显著,但是波动很大,很难预测。另一类是阿尔法因子,比如基本面因子。在不同的市场特征下,这几个因子会交替发挥作用。与风险因子不同,阿尔法因子很稳定,可以为基金组合创造比较好的收益。”

牛勇认为,短期来看,大小盘因子、主题因子等会对组合形成较大的正面影响。但由于这些因子的影响偏短期,如果量化基金的模型过于侧重这些交易性机会,短期可能会获得超额收益,但是胜率并不高,远远比不上基本面支撑股价上涨带来的长期超额收益。

对于高出同行逾10%的收益率,他表示:“在我们的量化体系中,基本面因子占的比重比较大,发挥的作用也比较明显,这也是这只基金在相当长时间能获得稳定回报的主要原因。”

管理难度不亚于主动基金

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