TWA calculation for SFO, FOMC and DFOP (parent)

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+\name{twa}
+\alias{twa}
+\title{
+  Function to calculate maximum time weighted average concentrations from kinetic models fitted with mkinfit
+}
+\description{
+This function calculates maximum moving window time weighted average concentrations
+(TWAs) for kinetic models fitted with \code{\link{mkinfit}}. Currently, only
+calculations for the parent are implemented for the SFO, FOMC and DFOP models,
+using the analytical formulas given in the PEC soil section of the FOCUS
+guidance.}
+\usage{
+  twa(fit, windows)
+}
+\arguments{
+  \item{fit}{
+    An object of class \code{\link{mkinfit}}.
+  }
+  \item{windows}{
+    The width of the time windows for which the TWAs should be calculated.
+  }
+}
+\value{
+  A numeric vector, named using the \code{windows} argument.
+}
+\examples{
+  fit <- mkinfit("FOMC", FOCUS_2006_C, quiet = TRUE)
+  twa(fit, c(7, 21))  
+}
+\references{
+  FOCUS (2006) \dQuote{Guidance Document on Estimating Persistence and
+  Degradation Kinetics from Environmental Fate Studies on Pesticides in EU
+  Registration} Report of the FOCUS Work Group on Degradation Kinetics,
+  EC Document Reference Sanco/10058/2005 version 2.0, 434 pp,
+  \url{http://http://esdac.jrc.ec.europa.eu/projects/degradation-kinetics}
+}
+\author{
+  Johannes Ranke
+}
+\keyword{ manip }