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#'@title Calculate G Efficiency
#'
#'@description Either calculates G-Efficiency by Monte Carlo sampling from the design space (ignoring constraints),
#'searching for the maximum point (slower but higher quality), or by using a user-specified candidate set
#'for the design space (fastest).
#'@return Normalized run matrix
#'@keywords internal
calculate_gefficiency = function(design, calculation_type = "random", randsearches = 10000, design_space_mm = NULL) {
if(!is.null(attr(design, "runmatrix"))) {
run_matrix = attr(design, "runmatrix")
} else {
run_matrix = design
}
if(is.null(randsearches)) {
randsearches = 10000
}
variables = all.vars(get_attribute(design,"model"))
designmm = get_attribute(design,"model.matrix")
modelentries = names(calculate_level_vector(run_matrix,get_attribute(design,"model"), FALSE))
model_entries_mul = gsub(":", "*", modelentries)
model_entries_mul[1] = 1
fulllist = list()
factorvars = attr(design,"contrastslist")
variables = variables[!variables %in% names(factorvars)]
rand_vector = function(factorlist, model_entries_mul) {
fulloutput = unlist(lapply(model_entries_mul, \(x) eval(parse(text=x), envir = factorlist)))
matrix(fulloutput,1,length(fulloutput))
}
calculate_optimality_for_point = function(x, infval = FALSE) {
for(i in seq_len(length(x))) {
fulllist[[i]] = x[i]
}
names(fulllist) = variables
for(i in seq_len(length(names(factorvars)))) {
numberlevels = length(levels(run_matrix[[names(factorvars)[i] ]]))
fulllist[[names(factorvars)[i] ]] = factorvars[[names(factorvars)[i] ]](numberlevels)[sample(seq_len(numberlevels),1),,drop=TRUE]
}
mc_mm = rand_vector(fulllist, model_entries_mul)
if(any(x > 1) || any(x < -1)) {
if(infval) {
return(Inf)
} else {
return(10000)
}
}
100 * (ncol(designmm)) / (nrow(designmm) * max(diag(mc_mm %*% solve(t(designmm) %*% designmm) %*% t(mc_mm))))
}
modelentries = names(calculate_level_vector(run_matrix,get_attribute(design,"model"), FALSE))
factorvars = attr(design,"contrastslist")
variables = all.vars(get_attribute(design,"model"))
variables = variables[!variables %in% names(factorvars)]
if(calculation_type == "random") {
vals = list()
lowest = 100
for(i in seq_len(randsearches)) {
vals[[i]] = calculate_optimality_for_point(2*runif(length(variables))-1)
if(vals[[i]] < lowest) {
lowest = vals[[i]]
}
}
return(min(unlist(vals)))
}
if(calculation_type == "optim") {
vals = list()
lowest = 100
for(i in seq_len(randsearches)) {
vals[[i]] = optim(2*runif(length(variables))-1,calculate_optimality_for_point, method = "SANN")$value
if(vals[[i]] < lowest) {
lowest = vals[[i]]
}
}
return(min(unlist(vals)))
}
if(calculation_type == "custom" && !is.null(design_space_mm)) {
return(GEfficiency(designmm, design_space_mm))
}
}
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