Fu, Wenjiang2018-03-122018-03-12December 22017-12December 2http://hdl.handle.net/10657/2878In this dissertation, a comprehensive kernel-based estimator, PCA Kernel (PK), is studied to estimate the integrated (realized) volatility under the effect of a more realistic and complex market micro-structure noise. Challenging situations, such as irregular diurnal sampling times, moving-average (MA) long-memory noises, inhomogeneous latent log-price processes, jumps, diurnal pattern trading volumes, and non-linear trading information related noises, are considered to test the performance of the proposed estimator. The Principal Components Analysis (PCA) approach is implemented to improve the estimator's stability, and the linear, polynomial, and Gaussian kernels are applied in the reproducing kernel Hilbert spaces to test their de-noise capacities. The kernel-based estimator dramatically improves the efficiency and accuracy of volatility estimation in terms of both the empirical variance and bias.application/pdfengThe author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).PCA KernelIntegrated (realized) volatilityThe reproducing kernel Hilbert spaces2018-03-12Thesisborn digital