\name{npext}
\docType{data}
\alias{npext}
\encoding{latin1}
\title{Nelson \& Plosser extended data set}
\description{
  This data set contains the fourteen U.S. economic time series used by
  Schotman \& Dijk. All series are transformed by taking logarithms
  except for the bond yield. The sample period ends in 1988.
}
\usage{data(npext)}
\format{
  A data frame containing fourteen series.
		
  \tabular{rl}{
    \code{year} \tab Time index from 1860 until 1988. \cr 
    \code{realgnp} \tab Real GNP, [Billions of 1958 Dollars], \cr
    \tab [1909 -- 1988] \cr
    \code{nomgnp} \tab Nominal GNP, \cr
    \tab [Millions of Current Dollars], [1909 -- 1988] \cr
    \code{gnpperca} \tab Real Per Capita GNP, \cr
    \tab [1958 Dollars], [1909 -- 1988] \cr
    \code{indprod} \tab Industrial Production Index, \cr
    \tab [1967 = 100], [1860 -- 1988] \cr
    \code{employmt} \tab Total Employment, \cr
    \tab [Thousands], [1890 -- 1988] \cr
    \code{unemploy} \tab Total Unemployment Rate, \cr
    \tab [Percent], [1890 -- 1988] \cr
    \code{gnpdefl} \tab GNP Deflator, \cr
    \tab [1958 = 100], [1889 -- 1988] \cr
    \code{cpi} \tab Consumer Price Index, \cr
    \tab [1967 = 100], [1860 -- 1988] \cr
    \code{wages} \tab Nominal Wages \cr
    \tab (Average annual earnings per full-time employee in manufacturing), \cr
    \tab [current Dollars], [1900 -- 1988] \cr
    \code{realwag} \tab Real Wages, \cr
    \tab [Nominal wages/CPI], [1900 -- 1988] \cr
    \code{M} \tab Money Stock (M2), \cr
    \tab [Billions of Dollars, annual averages], [1889 -- 1988] \cr
    \code{velocity} \tab Velocity of Money, \cr
    \tab [1869 -- 1988] \cr
    \code{interest} \tab Bond Yield (Basic Yields of 30-year
       corporate bonds), \cr
    \tab [Percent per annum], [1900 -- 1988] \cr
    \code{sp500} \tab Stock Prices, \cr
    \tab [Index; 1941 -- 43 = 100], [1871 -- 1988] \cr
    }
}
\source{
  Schotman, P.C. and van Dijk, H.K. (1991), On Bayesian Routes to Unit
  Roots, \emph{Journal of Applied Econometrics}, \bold{6}, 387--401.

  Koop, G. and Steel, M.F.J. (1994), A Decision-Theoretic Analysis of
  the Unit-Root Hypothesis using Mixtures of Elliptical Models,
  \emph{Journal of Business and Economic Statistics}, \bold{12}, 95--107. 
}
\references{\url{http://www.amstat.org/publications/jbes/}}
\author{Bernhard Pfaff}
\keyword{datasets}
\concept{data set Nelson Plosser macroeconomic variables}
