从"意见领袖"到"情感领袖":微博意见领袖的情感特征研究

微博中的意见领袖不仅是意见、认知和信息的扩散节点,也扮演着社会"情感领袖"的角色,并体现出鲜明的情感偏向特征,尤其是特定类型的情感传导.基于对新浪微博用户(N=38985)及其每人1000条帖子的采样,对情感和用户类型进行实证分析.研究结果认为:粉丝数越多的微博用户其"情感化"偏向显著增强,而非情感化、无情感的内容显著减少,意见领袖不是冷静、客观、无情感的信息中介,而体现出"后真相"社会情感策动源的特征;微博意见领袖存在特定的情感类型偏向,不是任一种类的情感的加强都与意见领袖地位提升有关,它只偏倚于特定类型;微博情感领袖存在特定的用户类型偏向,进行k-means方式聚类后发现,粉丝量越多、影响力层级越高的用户中,"怒怼型"的比例较高,而其他类型则相对较低.     

A Dynamic Equilibrium Model of International Portfolio Holdings

This paper develops a continuous‐time equilibrium model of a two‐country exchange economy with heterogeneous agents and nontraded goods. Nontraded goods play the role of state variables that shift the marginal utility of traded goods. This affects prices and generates dynamic hedging demands that explain the well documented home bias puzzle in international equity portfolios. When calibrated to both consumption and production data, the model is able to generate significative home bias in equity portfolios. A new methodology, based on Malliavin calculus, is presented to solve for the portfolio policies along the equilibrium path. This methodology allows one to reduce the determination of equilibrium portfolio holdings to the solution of a linear algebraic system, rather than a partial differential equation.