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#' @rdname standardize
#' @export
unstandardize <- function(x, ...) {
UseMethod("unstandardize")
}
#' @rdname standardize
#' @export
unstandardise <- unstandardize
#' @rdname standardize
#' @export
unstandardize.numeric <- function(x,
center = NULL,
scale = NULL,
reference = NULL,
robust = FALSE,
two_sd = FALSE,
...) {
if (!is.null(reference)) {
if (robust) {
center <- stats::median(reference, na.rm = TRUE)
scale <- stats::mad(reference, na.rm = TRUE)
} else {
center <- mean(reference, na.rm = TRUE)
scale <- stats::sd(reference, na.rm = TRUE)
}
} else if (is.null(center) || is.null(scale)) {
if (all(c("center", "scale") %in% names(attributes(x)))) {
center <- attr(x, "center", exact = TRUE)
scale <- attr(x, "scale", exact = TRUE)
attr(x, "scale") <- attr(x, "center") <- NULL
} else if (all(c("scaled:center", "scaled:scale") %in% names(attributes(x)))) {
center <- attr(x, "scaled:center", exact = TRUE)
scale <- attr(x, "scaled:scale", exact = TRUE)
attr(x, "scaled:scale") <- attr(x, "scaled:center") <- NULL
} else {
insight::format_error("You must provide the arguments `center`, `scale` or `reference`.")
}
}
if (two_sd) {
scale <- 2 * scale
}
x * scale + center
}
#' @rdname standardize
#' @export
unstandardize.data.frame <- function(x,
center = NULL,
scale = NULL,
reference = NULL,
robust = FALSE,
two_sd = FALSE,
select = NULL,
exclude = NULL,
...) {
if (!is.null(reference)) {
i <- sapply(x, is.numeric)
i <- i[i]
reference <- reference[names(i)]
if (robust) {
center <- sapply(reference, stats::median, na.rm = TRUE)
scale <- sapply(reference, stats::mad, na.rm = TRUE)
} else {
center <- sapply(reference, mean, na.rm = TRUE)
scale <- sapply(reference, stats::sd, na.rm = TRUE)
}
} else if (is.null(center) || is.null(scale)) {
i <- sapply(x, function(k) {
is.numeric(k) && !is.null(a <- attributes(k)) && all(c("scale", "center") %in% names(a))
})
if (any(i)) {
i <- i[i]
center <- sapply(x[names(i)], attr, "center", exact = TRUE)
scale <- sapply(x[names(i)], attr, "scale", exact = TRUE)
} else if (all(c("center", "scale") %in% names(attributes(x)))) {
center <- attr(x, "center", exact = TRUE)
scale <- attr(x, "scale", exact = TRUE)
attr(x, "center") <- attr(x, "scale") <- NULL
i <- names(x) %in% names(scale)
i <- i[i]
} else {
insight::format_error("You must provide the arguments `center`, `scale` or `reference`.")
}
} else {
if (is.null(names(center))) {
i <- sapply(x, is.numeric)
names(center) <- names(scale) <- names(x[i])
}
i <- names(x) %in% names(center)
names(i) <- names(x)
i <- i[i]
}
if (two_sd) {
scale <- 2 * scale
}
# Select and deselect
cols <- names(i)
if (!is.null(select)) cols <- cols[cols %in% select]
if (!is.null(exclude)) cols <- cols[!cols %in% exclude]
# Apply unstandardization to cols
for (col in cols) {
x[col] <- unstandardize(x[[col]], center = center[[col]], scale = scale[[col]])
}
x
}
#' @export
unstandardize.factor <- function(x, ...) {
x
}
#' @export
unstandardize.character <- function(x, ...) {
x
}
#' @export
unstandardize.grouped_df <- function(x,
center = NULL,
scale = NULL,
reference = NULL,
robust = FALSE,
two_sd = FALSE,
...) {
insight::format_error("Cannot (yet) unstandardize a `grouped_df`.")
}
#' @export
unstandardize.matrix <- function(x,
center = NULL,
scale = NULL,
reference = NULL,
robust = FALSE,
two_sd = FALSE,
...) {
if (all(c("scaled:center", "scaled:scale") %in% names(attributes(x)))) {
center <- attr(x, "scaled:center", exact = TRUE)
scale <- attr(x, "scaled:scale", exact = TRUE)
attr(x, "scaled:center") <- attr(x, "scaled:scale") <- NULL
for (col in seq_len(ncol(x))) {
x[, col] <- unstandardize.numeric(x[, col], center = center[col], scale = scale[col])
}
} else {
scales <- attr(x, "scale")
centers <- attr(x, "center")
xl <- lapply(seq_len(ncol(x)), function(i) {
tmp <- x[, i]
attributes(tmp) <- list(center = centers[i], scale = scales[i])
tmp
})
xz <- lapply(xl, datawizard::unstandardize, ...)
x_out <- do.call(cbind, xz)
dimnames(x_out) <- dimnames(x)
x <- x_out
}
x
}
#' @export
unstandardize.array <- unstandardize.matrix
# Datagrid ----------------------------------------------------------------
#' @export
unstandardize.datagrid <- function(x, ...) {
x[names(x)] <- unstandardize(as.data.frame(x), reference = attributes(x)$data, ...)
x
}
#' @export
unstandardize.visualisation_matrix <- unstandardize.datagrid
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