# #author: Max Kuhn on http://caret.r-forge.r-project.org/custom_models.html
#
# fourStats <- function (data, lev = levels(data$obs), model = NULL) {
# ## This code will get use the area under the ROC curve and the
# ## sensitivity and specificity values using the current candidate
# ## value of the probability threshold.
# out <- c(twoClassSummary(data, lev = levels(data$obs), model = NULL))
#
# ## The best possible model has sensitivity of 1 and specificity of 1.
# ## How far are we from that value?
# coords <- matrix(c(1, 1, out["Spec"], out["Sens"]),
# ncol = 2,
# byrow = TRUE)
# colnames(coords) <- c("Spec", "Sens")
# rownames(coords) <- c("Best", "Current")
# c(out, Dist = dist(coords)[1])
# }
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