 Usage:  {mux,hatbeta,beta0,hatsigmae,hatsigmax)=eivvec1(w,y,sigue,siguu)  
 
 Input:

  w                      n x p matrix, the design variables 
                         
  y                      n x 1 matrix, the response 
                         
  sigue                  p x 1 matrix, the vector of covariances between 
                         u and e 
                         
  siguu                  p x p matrix, the covariance matrix of U 
                         
 Output:

  mux                    scalar, the mean value of x 
                         
  hatbeta1               vector, the estimate 
                         
  hatbeta0               scalar, the estimate 
                         
  hatsigmax              p x p matrix, the estimate of the covariance matrix of x 
                         
  hatsigmae              scalar, the estimate of the variance of error e 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
