Forecasting, Time Series Analysis, Fourier Transform, R, Ml So Good.
"1/2", "1", "3", "5", "10", "100")) hours.freqs <- 1/hours.period * 1/4 #Convert houry period to hourly freq, and then to quarterly freq spec.df$period <- 1/spec.df$freq spec.df freq spec.1 spec.2 spec.3 period 1 0.000078125 0 3.784085e-25 2.291720e-02 12800.00000 2 0.000156250 0 4.167051e-23