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-\name{calpredict}
-\alias{calpredict}
-\title{Estimate measurement results including confidence intervals}
-\description{
- This function generates estimates for x values from y values, including
- a confidence interval for the x values. The formulas in this function used
- for prediction of concentrations from (replicate) measurements are taken from
- the "Handbook of Chemometrics and Qualimetrics Part A" by D. L. Massart,
- Vandeginste, B. G. M., Buydens, L. M. C., De Jong, S., Lewi, P. J. and
- Smeyers-Verbeke, J, Elsevier, Amsterdam, 1997 and from the EURACHEM/CITAC
- report on "Quantifying uncertainty in analytical measurement", 2000,
- pp. 111f.
-}
-\usage{
- calpredict(yobs,xi,yi,xunit="",level=0.95,intercept=FALSE,syobs=FALSE)
-}
-\arguments{
- \item{yobs}{
- A numeric vector containing the observed data.
- }
- \item{xi}{
- A vector of x values of the calibration.
- }
- \item{yi}{
- A vector of y values of the calibration.
- }
- \item{xunit}{
- The unit of the given values on the x axis as a character string.
- }
- \item{level}{
- The desired confidence level for the confidence interval of the
- estimates. Defaults to 0.95.
- }
- \item{intercept}{
- Logical value determining if an intercept is to be fitted or not.
- Default is FALSE.
- }
- \item{syobs}{
- If TRUE, a standard deviation for the given y values is
- calculated, and the resulting confidence interval will
- include this variability (not validated yet). If FALSE (default), this
- standard deviation is not included in the
- confidence interval. If a numeric value is given,
- it is used for the standard deviation of "real samples",
- in addition to the standard deviation of the y values
- in the calibration (also not validated yet).
- }
-}
-\value{
- A list containing the estimate, its standard deviation and its
- confidence interval.
-}
-\examples{
-data(pahCalibration)
-attach(pahCalibration)
-y <- c(51.2,51.4,51.1,51.8)
-estimate <- calpredict(y,conc,acenaphthene,xunit="mg/L")
-}
-\author{
- Johannes Ranke
- \email{jranke@uni-bremen.de}
- \url{http://www.uft.uni-bremen.de/chemie/ranke}
-}
-\keyword{regression}

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