Fiecas, Mark
[University of Warwick, United Kingdom]
von Sachs, Rainer
[UCL]
Time series data obtained from neurophysiological signals is of- ten high-dimensional and the length of the time series is often short relative to the number of dimensions. Thus, it is difficult or sometimes impossible to compute statistics that are based on the spectral density matrix because estimates of these matrices are often numerically unstable. In this work, we discuss the importance of regularization for spectral analysis of high- dimensional time series and propose shrinkage estimation for estimating high-dimensional spectral density matrices. We use and develop the multi- variate Time-frequency Toggle (TFT) bootstrap procedure for multivariate time series to estimate the shrinkage parameters, and show that the multi- variate TFT bootstrap is theoretically valid. We show via simulations and an fMRI data set that failure to regularize the estimates of the spectral density matrix can yield unstable statistics, and that this can be alleviated by shrinkage estimation.
| Bibliographic reference |
Fiecas, Mark ; von Sachs, Rainer. Data-driven shrinkage of the spectral density matrix of a high-dimensional time series. In: Electronic Journal of Statistics, Vol. 8, p. 2975-3003 (2014) |
| Permanent URL |
http://hdl.handle.net/2078.1/154446 |
