Singularity problem
On Jan 8, 2010, at 4:50 PM, Moohwan Kim wrote:
Dear R family I have a problem with invertibility in a matrix. m1 <- ar(x, method='mle') Error in solve.default(res$hessian * length(x)) : Lapack routine dgesv: system is exactly singular How could I avoid this problem?
Take out the collinear terms. David Winsemius, MD Heritage Laboratories West Hartford, CT