Call:
lda(daformula, data = spdata)

Prior probabilities of groups:
 high   low 
0.631 0.369 

Group means:
           x1       x2       x3       x4
high 5.380283 4.657218 4.143085 2.864270
low  4.298141 1.606374 3.823953 4.957927

Coefficients of linear discriminants:
          LD1
x1 -0.2671608
x2 -0.5139005
x3 -0.3227814
x4  0.2757273