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Power spectrum calculation and fit

If z is a data series, a 1024 record list, will the following code
correctly produce a power spectrum and the least squares fit slope to
the log transformed power spectrum versus the log of the sequence? 
Thanks for any suggestions.  

ftofz1 = Abs[Fourier[z]];

ftofz1 = Take[%, 512];

ftzsq = %^2;

lnftzsq = Log[%];

Fit[lnftzsq, {1, x}, Log[x]]

Randy Cutter
Virginia Institute of Marine Science Route 1208 
Gloucester Point, VA 23062 USA

phone 804 684-7365
fax 804 684-7399 or 7045
email:  cutter at


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