How Does Fourier Analysis Explain Frequency Changes in Time Series Data?

[ramze]

Dear friends,

I generated a time series graph showing some modeled versus measured data (precipitation data)...The results show that the modeled data are sharper than the mesured data (more rounded on top)...Based on that, how can I explain the frequency content changes based on Fourier coefficient (Sharper higher frequency versus rounder lower frequency)?

Anotehr question to thing about: What is preferred a frequency (spactral) analysis or time series analysis? Why and why not?

Thanks in advance for your help.

 

[fresh_42]

Maybe you'll find some answers in

http://lampx.tugraz.at/~hadley/num/ch3/3.3a.php
https://www.le.ac.uk/users/dsgp1/SIGNALS/FIVESTAT.pdf

as I'm not familiar with statistical Fourier analysis.