Aggregated Projection Method: A New Approach for Group Factor Model
聚合投影法:组因子模型的新方法AI 解读 ↓
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聚合投影法:组因子模型的新方法AI 解读 ↓
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Identifying the global factors among grouped data is crucial in the group factor model. In this paper, we propose a novel objective function for the task by maximizing the average of correlations between the latent global factors and group factors, solved through the eigen-decomposition of the aggregated projection matrix. Our method is not only computationally efficient but also robust to strongly correlated local factors. We establish the consistency of the global/local factor number estimation and the consistency and asymptotic distributions of the estimated global/local factors and loadings. Simulation studies show that our method outperforms state-of-the-art methods in various scenarios. The proposed method is applied to analyze the growth rate of house prices in the United States, identifying one global factor that significantly influences national house prices and several local factors that demonstrate the effects of each state.