\name{max_twa_parent}
\alias{max_twa_parent}
\alias{max_twa_sfo}
\alias{max_twa_fomc}
\alias{max_twa_dfop}
\alias{max_twa_hs}
\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, DFOP and HS models,
using the analytical formulas given in the PEC soil section of the FOCUS
guidance.}
\usage{
  max_twa_parent(fit, windows)
  max_twa_sfo(M0 = 1, k, t)
  max_twa_fomc(M0 = 1, alpha, beta, t)
  max_twa_dfop(M0 = 1, k1, k2, g, t)
  max_twa_hs(M0 = 1, k1, k2, tb, t)
}
\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.
  }
  \item{M0}{
   The initial concentration for which the maximum time weighted
   average over the decline curve should be calculated. The default
   is to use a value of 1, which means that a relative maximum time
   weighted average factor (f_twa) is calculated.
  }
  \item{k}{
    The rate constant in the case of SFO kinetics.
  }
  \item{t}{
    The width of the time window.
  }
  \item{alpha}{
    Parameter of the FOMC model.
  }
  \item{beta}{
    Parameter of the FOMC model.
  }
  \item{k1}{
    The first rate constant of the DFOP or the HS kinetics.
  }
  \item{k2}{
    The second rate constant of the DFOP or the HS kinetics.
  }
  \item{g}{
    Parameter of the DFOP model.
  }
  \item{tb}{
    Parameter of the HS model.
  }
}
\value{
  For \code{max_twa_parent}, a numeric vector, named using the \code{windows} argument.
  For the other functions, a numeric vector of length one (also known as 'a
  number').
}
\examples{
  fit <- mkinfit("FOMC", FOCUS_2006_C, quiet = TRUE)
  max_twa_parent(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://esdac.jrc.ec.europa.eu/projects/degradation-kinetics}
}
\author{
  Johannes Ranke
}
\keyword{ manip }