CCE in heterogenous fixed-T panels
证明Pesaran(2006)的共同相关效应方法在时间期数固定、截面单元数大时，仍能对异质性斜率系数的交互效应模型进行一致且渐近正态的估计。
Summary The present paper shows that the CCE approach of Pesaran (2006) is more useful than commonly appreciated, in that it enables consistent and asymptotically normal estimation of interactive effects models with heterogeneous slope coefficients when the number of time periods, T, is fixed and only the number of cross-sectional units, N, is large.