10 Year. Morningstar rated the Global Technology Fund among 196, 196, 186 and 144 Technology funds for the overall rating and the 3-, 5-, and 10-year periods (as applicable) ending 02/28/2017, respectively.
Geometrically an eigenvector, corresponding to a real nonzero eigenvalue, points in a direction that is stretched by the transformation and the eigenvalue is the factor by which it is stretched. If the eigenvalue is negative, the direction is reversed.
Lagged regression models in the frequency domain. We could solve these equations for the Î²j using the sample autocovariance. and sample cross-covariance. But it is more convenient to use estimates of. the spectra and cross-spectrum. (Convolution with {Î²j} in the time domain is equivalent to multiplication.