1. Nonlinearity in Stochastic Processes: What it Is and Why it Matters -- 2. Detecting Nonlinear Serial Dependence -- 3. How to Run the Toolkit Program on a PC -- 4. Artificially Generated Data: Size Considerations -- 5. Artificially Generated Data: Power And Model Specification Considerations...

Much research has demonstrated the existence of patterns in high-frequency equity returns, return volatility, bid-ask spreads and trading volume. In this paper, we employ a new test for detecting periodicities based on a signal coherence function. The technique is applied to the returns, bid-ask...