[UAI] Expected value & covariance of linguistic variable

[Albena Tchamova]

Dear Friends,

I am looking for methods to calculate an expected value and covariance
of  linguistic variable. Please give me some appropriate references.
Thank you in advance for your cooperation.
           Best regards,
                                   Albena
Albena Tchamova
Bulgarian Academy of Sciences,
Central Laboratory for Parallel Processing,
 Sofia, Bulgaria
E-mail: [EMAIL PROTECTED]