From: jfindley@cinci.nospam.rr.com   
      
   In article ,   
   dpress@edwardgruf.com says...   
   >   
   > On Sun, 24 Jan 2021 08:03:44 -0500, Jeff Findley   
   >  wrote:   
   > >   
   > >Because standard experimental practice is to only change one variable so   
   > >you can compare the results of two tests.   
   >   
   > Be careful with such an absolute statement. Design of Experiments and   
   > Response Surface Methodology is widely used within the aerospace   
   > community for wind tunnel and propulsion tests. It all depends upon   
   > the type of testing and the range of variable possible.   
      
   Agreed.   
      
   Jeff   
      
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