This worksheet contains 6 sheets.
1)The first sheet is an example of FFT in excel.
2)The second sheet is a skeleton for you to mount your own FFT.
3)The third sheet is an example of inverse fft.
4)The fourth sheet is a skeleton of inverse fft.
5)The fifth sheet is an example of how to remove noise with fft and inverse fft.
6)The sixth sheet has information people about me and a link to recommendations from Stanford Books, where I learned about the fft
7)There is a bonus that try make forecast with period.