The main objective of this paper is to investigate whether the US, UK
and Japanese stock index futures markets have a similar volatility pro
cess. For this purpose, the common feature analysis proposed by Engle
and Susmel (1993) is applied to 1988-91 data after first removing pric
e innovations using vector autoregression. The results suggest that th
e three markets have a single common factor generating volatilities am
ong markets.