"Y" <-
structure(c(NA, 1.64, 1.44, 1.36, 1.65, 1.08, 1.09, 1.25, 1.25, 
1.3, 1.65, 1.57, NA, 1.68, 1.69, NA, 1.43, 1.44, 1.39, 1.52), .Dim = c(10, 
2))
"group" <-
c(1, 1, -1, -1, -1, 1, 1, 1, -1, -1)
"N" <- 10
"T" <- 2