Pinheiro/Bates Soybean nlme failure
Dear Mixed Effect Friends, Somehow, R(1021, Windows) seem to run differently from S Plus: The soybean example from Pinheiro/Bates on page 290 fails in R. (Soybean1 is Soybean with the NA and "critical" case removed. Same procedure with full Soybean).
fm1Soy.lis<-nlsList(weight~SSlogis(Time,Asym,xmid,scal),data=Soybean1) fm1Soy.nlme<-nlme(fm1Soy.lis)
Error: Singularity in backsolve at level 0, block 1 In addition: There were 50 or more warnings (use warnings() to see the first 50)
warnings()
Warning messages: 1: Singular precision matrix in level -1, block 1 2: Singular precision matrix in level -1, block 1 --------------------------------------- Dr. Dieter Menne Biomed Software 72074 T?bingen Tel (49) (7071) 52176 FAX (49) (7071) 55 10 46 dieter.menne at menne-biomed.de www.menne-biomed.de -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._