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\name{urca-internal}
\alias{.spcv}
\encoding{latin1}
\title{Critical values for Schmidt and Phillips Unit Root Test}
\description{
This function is an internal function and is called by
\code{ur.sp}. It computes the critical value of the Schmidt and
Phillips test, given a level of significance, the polynomial degree of
the test regression, the test type and the sample size.
}
\usage{
.spcv(obs, type, pol.deg, signif)
}
\arguments{
\item{obs}{The sample size.}
\item{type}{The test type.}
\item{pol.deg}{The polynomial degree.}
\item{signif}{The significance level.}
}
\value{
The critical value of the test.
}
\references{
Schmidt, P. and Phillips, P.C.B. (1992), LM Test for a Unit Root in
the Presence of Deterministic Trends, \emph{Oxford Bulletin of Economics and
Statistics}, \bold{54(3)}, 257--287.
Download possible at: \url{https://cowles.yale.edu/}, see rubric
'Discussion Papers (CFDPs)'.
}
\seealso{\code{\link{ur.sp}}.}
\author{Bernhard Pfaff}
\keyword{regression}
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