Gary's Student wrote...
Fourier is part of Microsfot's Analysis Toolpack
See:

http://office.microsoft.com/en-us/as...038731033.aspx
....

Did you read what LITTLE this site has to say about Fourier Analysis?
It's just the web version of online help, and it's pathetic.

The OP needs to run Tools Data Analysis, Fourier Analysis, and then
click on the Help button in Fourier Analysis dialog. The help info that
displays is more useful than the link you provided, but still pretty
skimpy.

Excel's implementation is a toy. The OP would be better off using a
real stats package to perform Fourier Analysis.