XPost: alt.fan.rush-limbaugh, alt.global-warming, alt.atheism   
   XPost: alt.politics.democrats   
   From: paul.aubrin@invalid.org   
      
   Le 27/02/2026 à 07:34, Samuel Spade a écrit :   
   >>   studied that at the university (signal processing).   
   > Then you should have known better.   
      
   I used this technique many times with full success. You can either   
   derive the two series, or you can detrend both.   
      
   Convolution low pass filter and fourrier transform :   
      
   https://www.woodfortrees.org/plot/hadsst3sh/derivative/mean:12/m   
   an:14/from:1958/normalise/plot/hadsst3gl/derivative/fourier:12/l   
   w-pass:96/inverse-fourier:20/from:1958/normalise   
      
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