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#' Highest Single Agent model
#'
#' This function returns response levels for when these are based on
#' Highest Single Agent (HSA) model.
#'
#' @inheritParams generalizedLoewe
hsa <- function(doseInput, parmInput, ...) {
pars <- parmInput
increasing <- pars["m1"] >= pars["b"] & pars["m2"] >= pars["b"]
decreasing <- pars["m1"] <= pars["b"] & pars["m2"] <= pars["b"]
## If agonist and antagonist, try to determine the leading compound and emit a
## warning.
if (!(increasing | decreasing)) {
warning("Marginal curves are diverging. HSA might be flawed.")
lead <- which.max(c(abs(pars["m1"] - pars["b"]),
abs(pars["m2"] - pars["b"])))
if (lead == 1)
applyFunction <- if (pars["m1"] > pars["b"]) max else min
else if (lead == 2)
applyFunction <- if (pars["m2"] > pars["b"]) max else min
} else {
applyFunction <- if (increasing) max else min
}
pred1 <- L4(doseInput[["d1"]], pars["h1"], pars["b"], pars["m1"], pars["e1"])
pred2 <- L4(doseInput[["d2"]], pars["h2"], pars["b"], pars["m2"], pars["e2"])
apply(cbind(pred1, pred2), 1, applyFunction)
}
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