Nothing
myffitYP4 <- function(x, myY, myd, myZ) {
if(length(x) != 2) stop("x must be a length 2 vector")
if(dim(myZ)[2] == 1) stop("check dim of Zmat")
x1 <- x[1]
x2 <- x[2]
tempT <- fitYP4(Y=myY, d=myd, Z=myZ, beta1=x1, beta2=x2)
return( - tempT$EmpLik)
}
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