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# Copyright (C) 2005, 2012, 2023 David Firth and Heather Turner
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 or 3 of the License
# (at your option).
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# A copy of the GNU General Public License is available at
# http://www.r-project.org/Licenses/
residSVD <- function(model, fac1, fac2, d = 1) {
if (!is.null(model$call$data)) {
Data <- as.data.frame(eval(model$call$data, parent.frame()))
fac1 <- eval(match.call()$fac1, Data, parent.frame())
fac2 <- eval(match.call()$fac2, Data, parent.frame())
}
if (!inherits(model, "lm"))
stop("model not of a class that inherits from class \"lm\"")
if (!is.factor(fac1)) stop("fac1 must be a factor")
if (!is.factor(fac2)) stop("fac2 must be a factor")
Data <- data.frame(fac1, fac2)
if (!is.null(na.action(model))) Data <- Data[-na.action(model), ]
weights <- if (!is.null(weights(model))) as.vector(weights(model)) else 1
X <- data.frame(rw = as.vector(residuals(model)) * weights, w = weights)
X <- lapply(X, tapply, Data, sum, simplify = TRUE)
X <- X$rw/X$w
X <- svd(naToZero(X), d, d)
uPart <- sqrt(X$d[seq(d)]) * t(X$u)
vPart <- sqrt(X$d[seq(d)]) * t(X$v)
# uPartNegative <- apply(uPart, 1, function(row) all(row < 0))
# vPartNegative <- apply(vPart, 1, function(row) all(row < 0))
# multiplier <- ifelse(uPartNegative + vPartNegative == 1, -1, 1)
multiplier <- 1
result <- t(cbind(uPart, vPart) * multiplier)
rownames(result) <- c(paste("fac1", levels(fac1), sep = "."),
paste("fac2", levels(fac2), sep = "."))
colnames(result) <- 1:d
drop(result)
}
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