An index of efficiency for the Athens Stock Exchange

Abstract

This paper attempts to construct a new more efficient index, which examines the behaviour
of stock return in the Athens Stock Exchange, the market efficiency in evaluating equity and finally
the relation between returns and volatility. Using daily data from January 1990 until December
1999, we examine the index of all the public quoted companies in the Athens Stock Exchange.
The data were collected from the Imperial College database. The models estimated are
a special case of the Generalised Autoregressive Conditional Heteroscedasticity (GARCH) family;
more specifically the GARCH (p,q)-M.