I have been try to work with Merror n I keep getting this message: Error in solve.default(H) : system is computationally singular: reciprocal condition number = 0 can some one please tell me what it mean and how to solve this. -- View this message in context: http://r.789695.n4.nabble.com/Merror-tp4632371.html Sent from the R help mailing list archive at Nabble.com.