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+\name{HS}
+\Rdversion{1.1}
+\alias{HS}
+\title{ Hockey-Stick kinetics }
+\description{
+  Function describing two exponential decline functions with a break point
+  between them.
+}
+\usage{
+HS(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://focus.jrc.ec.europa.eu/dk} 
+}
+\author{ Johannes Ranke }
+\examples{
+  \dontrun{plot(function(x) HS(x, 100, 2, 0.3, 0.5), 0, 2, ylim=c(0,100))}
+}
+\keyword{ manip }