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Diffstat (limited to 'R/loq.R')
-rw-r--r-- | R/loq.R | 20 |
1 files changed, 20 insertions, 0 deletions
@@ -0,0 +1,20 @@ +loq <- function(object, ..., alpha = 0.05, k = 3, n = 1, w = "auto") +{ + UseMethod("loq") +} + +loq.default <- function(object, ..., alpha = 0.05, k = 3, n = 1, w = "auto") +{ + stop("lod is only implemented for univariate lm objects.") +} + +loq.lm <- function(object, ..., alpha = 0.05, k = 3, n = 1, w = "auto") +{ + f <- function(x) { + y <- predict(object, data.frame(x = x)) + p <- inverse.predict(object, rep(y, n), ws = w, alpha = alpha) + (p[["Prediction"]] - k * p[["Confidence"]])^2 + } + tmp <- optimize(f,interval=c(0,max(object$model$x))) + return(tmp$minimum) +} |