hhj                     Hall, Horowitz, and Jing (1995) "HHJ" Algorithm
                        to Select the Optimal Block-Length
plot.hhj                Plot MSE Function for HHJ Algorithm
plot.pwsd               Plot Correlogram for Politis and White
                        Auto-Correlation Implied Hypothesis Test
pwsd                    Politis and White (2004) Spectral Density
                        "PWSD" Automatic Block-Length Selection
