Nothing
par.est <- function(data=data)
{
if (!is.matrix(data)) stop("data must be a matrix")
if (ncol(data) < 2) stop("data must have at least 2 columns")
n <- nrow(data)
p <- ncol(data)-1
Y <- data[, 1]
X <- data[, -1]
if (!is.matrix(X)) X <- as.matrix(X)
X.X <- t(X)%*%X
X.Y <- t(X)%*%Y
beta.est <- symsolve(X.X, X.Y)
return(beta.est)
}
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