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