

    \filetitle{pct}{Percent rate of change}{tseries/pct}

	\paragraph{Syntax}
 
 \begin{verbatim}
 x = pct(x)
 x = pct(x,k)
 \end{verbatim}
 \paragraph{Input arguments}
 
 \begin{itemize}
 \item
   \texttt{x} {[} tseries {]} - Input tseries object.
 \item
   \texttt{k} {[} numeric {]} - Time shift over which the rate of change
   will be computed, i.e.~between time t and t+k; if not specified
   \texttt{k} will be set to --1.
 \end{itemize}
 \paragraph{Output arguments}
 
 \begin{itemize}
 \item
   \texttt{x} {[} tseries {]} - Percentage rate of change in the input
   data.
 \end{itemize}
 \paragraph{Description}
 
 \paragraph{Example}


