Corradi, Valentina; Swanson, Norman R. - In: Journal of Econometrics 182 (2014) 1, pp. 100-118
Mild factor loading instability, particularly if sufficiently independent across the different constituent variables, does not affect the estimation of the number of factors, nor subsequent estimation of the factors themselves (see e.g. Stock and Watson (2009)). This result does not hold in...