A data frame with 16 observations on the following 9 variables.
A
a factor with levels -1 1
B
a factor with levels -1 1
C
a factor with levels -1 1
D
a factor with levels -1 1
E
a factor with levels -1 1
F
a factor with levels -1 1
G
a factor with levels -1 1
H
a factor with levels -1 1
y1
a numeric vector