% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/est_dcce.R
\name{.check_csa_rank}
\alias{.check_csa_rank}
\title{Check rank of augmented CSA matrix}
\usage{
.check_csa_rank(Z, unit_id = "")
}
\arguments{
\item{Z}{Numeric matrix: the CSA matrix for a given unit.}

\item{unit_id}{Character: unit identifier for warning messages.}
}
\value{
Logical: \code{TRUE} if full rank, \code{FALSE} otherwise.
}
\description{
Verifies that the CSA matrix (with lags) is full column rank. Warns but
continues if rank deficient (MG estimates remain consistent per
Chudik & Pesaran 2015, p.398).
}
\keyword{internal}
