A data frame with 8 observations on the following 8 variables.
A
a factor with levels -1 1
B
a factor with levels -1 1
C
a factor with levels -1 1
fold
a factor with levels original mirror
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
y
a numeric vector