abstract = "This paper examines the out-of-sample performance of
intraday technical trading strategies selected using
two methodologies, a genetic program and an optimized
linear forecasting model. When realistic transaction
costs and trading hours are taken into account, we find
no evidence of excess returns to the trading rules
derived with either methodology. Thus, our results are
consistent with market efficiency. We do, however, find
that the trading rules discover some remarkably stable
patterns in the data.",