Adding a small random value (0,0001-0,0009) to all values helped to solve the problem. Thank You everyone, who helped. -- View this message in context: http://r.789695.n4.nabble.com/system-is-computationally-singular-reciprocal-condition-number-tp4647472p4647540.html Sent from the R help mailing list archive at Nabble.com.