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| author | ranke <ranke@5fad18fb-23f0-0310-ab10-e59a3bee62b4> | 2007-10-01 19:48:47 +0000 | 
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| committer | ranke <ranke@5fad18fb-23f0-0310-ab10-e59a3bee62b4> | 2007-10-01 19:48:47 +0000 | 
| commit | 6865f34bfe02ceae7027fcb0bc7d074d84369cf1 (patch) | |
| tree | 11e4032df8c260df0a17b67b12ab9f9a98659c43 /trunk/man/loq.Rd | |
| parent | 14a5af60a36071f6a9b4471fdf183fd91e89e1cd (diff) | |
Further work on the new repository layout
git-svn-id: http://kriemhild.uft.uni-bremen.de/svn/chemCal@23 5fad18fb-23f0-0310-ab10-e59a3bee62b4
Diffstat (limited to 'trunk/man/loq.Rd')
| -rw-r--r-- | trunk/man/loq.Rd | 77 | 
1 files changed, 0 insertions, 77 deletions
| diff --git a/trunk/man/loq.Rd b/trunk/man/loq.Rd deleted file mode 100644 index 7541e77..0000000 --- a/trunk/man/loq.Rd +++ /dev/null @@ -1,77 +0,0 @@ -\name{loq} -\alias{loq} -\alias{loq.lm} -\alias{loq.rlm} -\alias{loq.default} -\title{Estimate a limit of quantification (LOQ)} -\usage{ -  loq(object, \dots, alpha = 0.05, k = 3, n = 1, w.loq = "auto", -    var.loq = "auto") -} -\arguments{ -  \item{object}{ -    A univariate model object of class \code{\link{lm}} or  -    \code{\link[MASS:rlm]{rlm}}  -    with model formula \code{y ~ x} or \code{y ~ x - 1},  -    optionally from a weighted regression. If weights are specified -    in the model, either \code{w.loq} or \code{var.loq} have to  -    be specified. -  } -  \item{alpha}{ -    The error tolerance for the prediction of x values in the calculation. -  } -  \item{\dots}{ -    Placeholder for further arguments that might be needed by  -    future implementations. -  } -  \item{k}{  -    The inverse of the maximum relative error tolerated at the -    desired LOQ. -  } -  \item{n}{ -    The number of replicate measurements for which the LOQ should be -    specified. -  } -  \item{w.loq}{ -    The weight that should be attributed to the LOQ. Defaults -    to one for unweighted regression, and to the mean of the weights -    for weighted regression. See \code{\link{massart97ex3}} for  -    an example how to take advantage of knowledge about the  -    variance function. -  } -  \item{var.loq}{ -    The approximate variance at the LOQ. The default value is  -    calculated from the model. -  } -} -\value{ -  The estimated limit of quantification for a model used for calibration. -} -\description{ -  The limit of quantification is the x value, where the relative error -  of the quantification given the calibration model reaches a prespecified -  value 1/k. Thus, it is the solution of the equation -    \deqn{L = k c(L)}{L = k * c(L)} -  where c(L) is half of the length of the confidence interval at the limit L -  (DIN 32645, equivalent to ISO 11843). c(L) is internally estimated by -  \code{\link{inverse.predict}}, and L is obtained by iteration.  -} -\note{ -  - IUPAC recommends to base the LOQ on the standard deviation of the signal -    where x = 0.  -  - The calculation of a LOQ based on weighted regression is non-standard -    and therefore not tested. Feedback is welcome. -} -\examples{ -data(massart97ex3) -attach(massart97ex3) -m <- lm(y ~ x) -loq(m) - -# We can get better by using replicate measurements -loq(m, n = 3) -} -\seealso{ -  Examples for \code{\link{din32645}}   -} -\keyword{manip} | 
