On the independence of transactions on the New York Stock exchange

This paper presents empirical tests of a model of intraday transaction price walks haveior events both the existence of price reversal's in transaction price sequence with random, New York daily. and longer different intervlas. In genral, we find that trasaction of independ events both with respect to their time execution and the siem and (bid or ask) or whick thaye are executed. Over very short intervals times, however, transapction tend to cluster in time and on a particular side of the market. We conjecture that this latter phenomenon is a consequence of market procedures on the New York Stock Exchange.