Bahri, S. Saiful; Leger, Lawrence - In: Applied Financial Economics 11 (2001) 4, pp. 411-422
The stability of risk factors in the UK stock market is examined over time and across stock samples. Risk factors were identified by principal components analysis (PCA) on 22 small samples of stocks, over short time horizons. Stability across samples was investigated by a second-stage PCA, to...