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\name{HS.solution}
\alias{HS.solution}
\title{ Hockey-Stick kinetics }
\description{
Function describing two exponential decline functions with a break point
between them.
}
\usage{
HS.solution(t, parent.0, k1, k2, tb)
}
\arguments{
\item{t}{ Time. }
\item{parent.0}{ Starting value for the response variable at time zero. }
\item{k1}{ First kinetic constant. }
\item{k2}{ Second kinetic constant. }
\item{tb}{ Break point. Before this time, exponential decline according
to \code{k1} is calculated, after this time, exponential decline proceeds
according to \code{k2}. }
}
\value{
The value of the response variable at time \code{t}.
}
\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}
}
\examples{
plot(function(x) HS.solution(x, 100, 2, 0.3, 0.5), 0, 2, ylim=c(0,100))
}
\keyword{ manip }
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