Nothing
#' @describeIn boot Bootstrap a single variable or a grouped variable
#' @export
boot.formula <-
function(formula, data, subset, ...)
{
if (missing(formula) || (length(formula) > 3L) )
stop("'formula' missing or incorrect")
m <- match.call(expand.dots = FALSE)
if (is.matrix(eval(m$data, parent.frame())))
m$data <- as.data.frame(data)
m[[1L]] <- as.name("model.frame")
m$... <- NULL
mf <- eval(m, parent.frame())
nmiss <- length(attr(mf, "na.action"))
if (nmiss > 0)
cat("\n ", nmiss, "observation(s) removed due to missing values.\n")
varnames <- names(mf)
if (length(formula) == 2L){
g <- NULL
y <- mf[[1]]
}
else{
response <- attr(attr(mf, "terms"), "response")
y <- mf[[response]]
g <- mf[[-response]]
}
y <- do.call("boot", c(list(y, g, x.name=varnames[1]), list(...)))
y
}
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