Subject No 7 5 12 9 10 2 4 3 11 1 8 6
Ranks of Z (riz = 1) 1 2.5 2.5 4.5 4.5 6 7 8.5 8.5 10 11 12
Rank of x (rix) 2 3 6 4 11 5 12 1 8.5 8.5 7 10
Rank of y (riy) 1 5.5 7 2.5 4 12 2.5 9 5.5 8 10 11
Table 1: Natural Order of the Ranks of Maternal Age (z) with the Corresponding Ranks for Maternal Weight (x) and Child Birth Weight (y).