e8f5b4fb   
   From: mailbox@dmitry-kazakov.de   
      
   On Wed, 24 Sep 2008 11:31:58 -0700 (PDT), Ray wrote:   
      
   > Membership functions may have different shapes (triangular, bell-   
   > shape, trapezoid, etc.). Can anyone tell me please if there is any   
   > established criteria or rule of thumb that can help make a sensible   
   > choice of the membership function ? Thank you so much for your help.   
      
   In this form it is a meaningless question. It is like to ask if there is a   
   criteria to choose between odd, prime and perfect numbers.   
      
   The class of membership functions is determined by the way of fuzzy set   
   construction, i.e. ultimately by some a priori knowledge about the   
   application problem.   
      
   --   
   Regards,   
   Dmitry A. Kazakov   
   http://www.dmitry-kazakov.de   
      
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