R/Kmenta.R

#' Partly Artifical Data on the U. S. Economy
#'
#' @docType data
#'
#' @usage Kmenta
#'
#' @description These are partly contrived data from Kmenta (1986), constructed
#' to illustrate estimation of a simultaneous-equation econometric model. The data 
#' are an annual time-series for the U.S. economy from 1922 to 1941. The values of the
#' exogenous variables `D`, and `F`, and `A` are real, while those of the endogenous
#' variables are simulated according to the linear simultaneous equation model fit in the help
#' page for \code{link{lm2sls}}.
#'
#' @format A data frame with 20 rows and 5 columns.
#' \describe{
#'   \item{Q}{food consumption per capita.}
#'   \item{P}{ratio of food prices to general consumer prices.}
#'   \item{D}{disposible income in constant dollars.}
#'   \item{F}{ratio of preceding year's prices received by farmers to general consumer prices.}
#'   \item{A}{time in years.}
#'   }
#'
#' @source Kmenta, J. (1986) \emph{Elements of Econometrics, Second Edition}, Macmillan.
#'
"Kmenta"