A     B
1     2
2     4
3     6
4     8

variable   value value_Z   ID

 A            1  -1.16      1
 A            2  -0.387     2
 A            3   0.387     3
 A            4   1.16      4
 B            2  -1.16      1
 B            4  -0.387     2
 B            6   0.387     3
 B            8   1.16      4