现有研究的一个重要缺陷是无法精确地描述交易者个体羊群行为的分布及其程度,本文依据LSV及其衍生模型的思路,提出了基于分割聚类的矩阵化改进模型,并针对我国机构投资者,使用该改进模型对我国开放式基金的羊群效应进行了检验,结果发现:机构投资者个体的羊群效应分布呈现尖峰左偏的非标准形态;机构投资者在交易大盘股时的羊群效应比较明显;市场整体的羊群效应震荡增加;机构投资者个体的羊群行为会增加其投资时的收益和风险。
In order to give a precise description of the individual herd behavior,we develop a matrix model based on partitioning clustering algorithm by use of LSV models.Focusing on institutional investors,we use this new model to examine the herd behavior of open-ended funds in our country and find that,the institutional investors' individual herd behavior index show a leptokurtic and negatively skewed distribution;institutional investors prefer to herd in large-cap stocks;the trend of market's general herd behavior is upward;and institutional investors' herd behavior increases both gains and risks.