Fast Fourier Transform and Time-Series Forecasting in R

Question

After reviewing the literature available for FFT, I saw very little documentation of employing FFT for macroeconomic data. Can you please give sources to utilize FFT using time-series data in R? Thank you for your time.

Answer 1

Don't waste your time with applying FFT's to macroeconomic data. If there are cycles in the data, then the only things to find is the fundamental frequency and probably a second harmonic. All else is noise.

An autocorrelation function is the (much) better tool here.