Olá retorno aqui com a minha duvida anterior:
Estou rodando um script com a função lme do pacote nlme e esta dando um 
erro.Após eu rodar o modelo usando lme aparece:
Erro em MEEM(object, conLin, control$niterEM) : Singularity in backsolve at 
level 0, block 1
Revisei os dados e o script e esta tudo ok.O que pode estar acontecendo?
Att,

pois não sei responder no fórum....
O arquivoa ser carregado esta no anexo
Segue o meu comando para que alguém possa tentar> cruza <- 
read.table("C:/Users/Victor/Dropbox/projeto bezerras/Dados/cernelha.txt", 
header=T,)> cruza   Bezerro Tratamento   ACd  Data    DN   DJN  Sexo  ACD 
Idade1      423          1 81.33 41937 41930 41948 FALSE 81.0    672      423   
       1 81.59 41944 41930 41948 FALSE 81.0    743      423          1 82.07 
41951 41930 41948 FALSE 81.0    814      423          1 83.62 41958 41930 41948 
FALSE 81.0    885      423          1 83.72 41965 41930 41948 FALSE 81.0    906 
     425          1 81.38 41937 41930 41962 FALSE 81.0    677      425          
1 81.95 41944 41930 41962 FALSE 81.0    748      425          1 82.40 41951 
41930 41962 FALSE 81.0    819      425          1 83.00 41958 41930 41962 FALSE 
81.0    8810     425          1 83.07 41965 41930 41962 FALSE 81.0    9011     
426          1 81.09 41937 41930 41968 FALSE 81.0    6712     426          1 
81.69 41944 41930 41968 FALSE 81.0    7413     426          1 82.29 41951 41930 
41968 FALSE 81.0    8114     426          1 83.20 41958 41930 41968 FALSE 81.0  
  8815     426          1 83.28 41965 41930 41968 FALSE 81.0    9016     428    
      1 81.69 41937 41930 41980 FALSE 81.0    6717     428          1 82.32 
41944 41930 41980 FALSE 81.0    7418     428          1 83.34 41951 41930 41980 
FALSE 81.0    8119     428          1 83.65 41958 41930 41980 FALSE 81.0    
8820     428          1 83.74 41965 41930 41980 FALSE 81.0    9021     421      
    2 82.72 41937 41930 41931 FALSE 79.5    6722     421          2 84.07 41944 
41930 41931 FALSE 79.5    7423     421          2 84.98 41951 41930 41931 FALSE 
79.5    8124     421          2 85.77 41958 41930 41931 FALSE 79.5    8825     
421          2 85.99 41965 41930 41931 FALSE 79.5    9026     429          2 
81.29 41937 41930 41989 FALSE 81.0    6727     429          2 83.21 41944 41930 
41989 FALSE 81.0    7428     429          2 84.47 41951 41930 41989 FALSE 81.0  
  8129     429          2 85.75 41958 41930 41989 FALSE 81.0    8830     429    
      2 85.91 41965 41930 41989 FALSE 81.0    9031     430          2 85.61 
41937 41930 42007 FALSE 83.5    6732     430          2 87.20 41944 41930 42007 
FALSE 83.5    7433     430          2 87.53 41951 41930 42007 FALSE 83.5    
8134     430          2 87.87 41958 41930 42007 FALSE 83.5    8835     430      
    2 88.02 41965 41930 42007 FALSE 83.5    9036     438          2 90.66 41937 
41930 42063 FALSE 89.0    6737     438          2 91.99 41944 41930 42063 FALSE 
89.0    7438     438          2 92.80 41951 41930 42063 FALSE 89.0    8139     
438          2 94.07 41958 41930 42063 FALSE 89.0    8840     438          2 
94.25 41965 41930 42063 FALSE 89.0    9041     422          3 83.43 41937 41930 
41933 FALSE 83.0    6742     422          3 84.17 41944 41930 41933 FALSE 83.0  
  7443     422          3 84.65 41951 41930 41933 FALSE 83.0    8144     422    
      3 84.91 41958 41930 41933 FALSE 83.0    8845     422          3 84.97 
41965 41930 41933 FALSE 83.0    9046     427          3 79.06 41937 41930 41978 
FALSE 78.4    6747     427          3 79.86 41944 41930 41978 FALSE 78.4    
7448     427          3 80.65 41951 41930 41978 FALSE 78.4    8149     427      
    3 81.66 41958 41930 41978 FALSE 78.4    8850     427          3 81.78 41965 
41930 41978 FALSE 78.4    9051     432          3 82.79 41937 41930 42018 FALSE 
80.2    6752     432          3 83.80 41944 41930 42018 FALSE 80.2    7453     
432          3 84.64 41951 41930 42018 FALSE 80.2    8154     432          3 
85.60 41958 41930 42018 FALSE 80.2    8855     432          3 85.79 41965 41930 
42018 FALSE 80.2    9056     435          3 89.95 41937 41930 42025 FALSE 88.5  
  6757     435          3 90.69 41944 41930 42025 FALSE 88.5    7458     435    
      3 91.34 41951 41930 42025 FALSE 88.5    8159     435          3 92.30 
41958 41930 42025 FALSE 88.5    8860     435          3 92.43 41965 41930 42025 
FALSE 88.5    9061     424          4 82.57 41937 41930 41954 FALSE 82.5    
6762     424          4 83.02 41944 41930 41954 FALSE 82.5    7463     424      
    4 83.17 41951 41930 41954 FALSE 82.5    8164     424          4 83.33 41958 
41930 41954 FALSE 82.5    8865     424          4 83.35 41965 41930 41954 FALSE 
82.5    9066     431          4 82.99 41937 41930 42013 FALSE 81.0    6767     
431          4 85.85 41944 41930 42013 FALSE 81.0    7468     431          4 
87.54 41951 41930 42013 FALSE 81.0    8169     431          4 89.33 41958 41930 
42013 FALSE 81.0    8870     431          4 89.62 41965 41930 42013 FALSE 81.0  
  9071     433          4 84.94 41937 41930 42020 FALSE 81.4    6772     433    
      4 86.87 41944 41930 42020 FALSE 81.4    7473     433          4 88.33 
41951 41930 42020 FALSE 81.4    8174     433          4 88.99 41958 41930 42020 
FALSE 81.4    8875     433          4 89.25 41965 41930 42020 FALSE 81.4    
9076     436          4 87.64 41937 41930 42036 FALSE 87.3    6777     436      
    4 88.81 41944 41930 42036 FALSE 87.3    7478     436          4 89.17 41951 
41930 42036 FALSE 87.3    8179     436          4 90.48 41958 41930 42036 FALSE 
87.3    8880     436          4 90.58 41965 41930 42036 FALSE 87.3    90
str(cruza)'data.frame':   80 obs. of  9 variables: $ Bezerro   : int  423 423 
423 423 423 425 425 425 425 425 ... $ Tratamento: int  1 1 1 1 1 1 1 1 1 1 ... 
$ ACd       : num  81.3 81.6 82.1 83.6 83.7 ... $ Data      : int  41937 41944 
41951 41958 41965 41937 41944 41951 41958 41965 ... $ DN        : int  41930 
41930 41930 41930 41930 41930 41930 41930 41930 41930 ... $ DJN       : int  
41948 41948 41948 41948 41948 41962 41962 41962 41962 41962 ... $ Sexo      : 
logi  FALSE FALSE FALSE FALSE FALSE FALSE ... $ ACD       : num  81 81 81 81 81 
81 81 81 81 81 ... $ Idade     : int  67 74 81 88 90 67 74 81 88 90 ...
library(nlme)> attach(cruza)> fTrat<-as.factor(Tratamento)> class(fTrat)[1] 
"factor"> class(ACd)[1] "numeric"> class(ACD)[1] "numeric"> class(Data)[1] 
"integer"> Data<-as.factor(Data)> simcomp.ran <- lme(ACd ~ DJN + ACD + fTrat + 
Data + fTrat:Data + ACD*fTrat + fTrat*DJN,+ random= ~1 | Bezerro/fTrat)Erro em 
MEEM(object, conLin, control$niterEM) :   Singularity in backsolve at level 0, 
block 1

Muito obrigado pela ajuda e desculpe não saber responder no fórum.
Abraço a todos!
Victor Ionatan FiorezeMédico Veterinário e ZootecnistaMestrando em Nutrição de 
Ruminantes, PPGZ-UFPelBolsista Capes
Integrante GERUMEN
(53) 81032887lattes: http://lattes.cnpq.br/5026587958713372
                                          
Bezerro Tratamento      ACd     Data    DN      DJN     Sexo    ACD     Idade
423     1       81.33   41937   41930   41948   F       81.00   67
423     1       81.59   41944   41930   41948   F       81.00   74
423     1       82.07   41951   41930   41948   F       81.00   81
423     1       83.62   41958   41930   41948   F       81.00   88
423     1       83.72   41965   41930   41948   F       81.00   90
425     1       81.38   41937   41930   41962   F       81.00   67
425     1       81.95   41944   41930   41962   F       81.00   74
425     1       82.40   41951   41930   41962   F       81.00   81
425     1       83.00   41958   41930   41962   F       81.00   88
425     1       83.07   41965   41930   41962   F       81.00   90
426     1       81.09   41937   41930   41968   F       81.00   67
426     1       81.69   41944   41930   41968   F       81.00   74
426     1       82.29   41951   41930   41968   F       81.00   81
426     1       83.20   41958   41930   41968   F       81.00   88
426     1       83.28   41965   41930   41968   F       81.00   90
428     1       81.69   41937   41930   41980   F       81.00   67
428     1       82.32   41944   41930   41980   F       81.00   74
428     1       83.34   41951   41930   41980   F       81.00   81
428     1       83.65   41958   41930   41980   F       81.00   88
428     1       83.74   41965   41930   41980   F       81.00   90
421     2       82.72   41937   41930   41931   F       79.50   67
421     2       84.07   41944   41930   41931   F       79.50   74
421     2       84.98   41951   41930   41931   F       79.50   81
421     2       85.77   41958   41930   41931   F       79.50   88
421     2       85.99   41965   41930   41931   F       79.50   90
429     2       81.29   41937   41930   41989   F       81.00   67
429     2       83.21   41944   41930   41989   F       81.00   74
429     2       84.47   41951   41930   41989   F       81.00   81
429     2       85.75   41958   41930   41989   F       81.00   88
429     2       85.91   41965   41930   41989   F       81.00   90
430     2       85.61   41937   41930   42007   F       83.50   67
430     2       87.20   41944   41930   42007   F       83.50   74
430     2       87.53   41951   41930   42007   F       83.50   81
430     2       87.87   41958   41930   42007   F       83.50   88
430     2       88.02   41965   41930   42007   F       83.50   90
438     2       90.66   41937   41930   42063   F       89.00   67
438     2       91.99   41944   41930   42063   F       89.00   74
438     2       92.80   41951   41930   42063   F       89.00   81
438     2       94.07   41958   41930   42063   F       89.00   88
438     2       94.25   41965   41930   42063   F       89.00   90
422     3       83.43   41937   41930   41933   F       83.00   67
422     3       84.17   41944   41930   41933   F       83.00   74
422     3       84.65   41951   41930   41933   F       83.00   81
422     3       84.91   41958   41930   41933   F       83.00   88
422     3       84.97   41965   41930   41933   F       83.00   90
427     3       79.06   41937   41930   41978   F       78.40   67
427     3       79.86   41944   41930   41978   F       78.40   74
427     3       80.65   41951   41930   41978   F       78.40   81
427     3       81.66   41958   41930   41978   F       78.40   88
427     3       81.78   41965   41930   41978   F       78.40   90
432     3       82.79   41937   41930   42018   F       80.20   67
432     3       83.80   41944   41930   42018   F       80.20   74
432     3       84.64   41951   41930   42018   F       80.20   81
432     3       85.60   41958   41930   42018   F       80.20   88
432     3       85.79   41965   41930   42018   F       80.20   90
435     3       89.95   41937   41930   42025   F       88.50   67
435     3       90.69   41944   41930   42025   F       88.50   74
435     3       91.34   41951   41930   42025   F       88.50   81
435     3       92.30   41958   41930   42025   F       88.50   88
435     3       92.43   41965   41930   42025   F       88.50   90
424     4       82.57   41937   41930   41954   F       82.50   67
424     4       83.02   41944   41930   41954   F       82.50   74
424     4       83.17   41951   41930   41954   F       82.50   81
424     4       83.33   41958   41930   41954   F       82.50   88
424     4       83.35   41965   41930   41954   F       82.50   90
431     4       82.99   41937   41930   42013   F       81.00   67
431     4       85.85   41944   41930   42013   F       81.00   74
431     4       87.54   41951   41930   42013   F       81.00   81
431     4       89.33   41958   41930   42013   F       81.00   88
431     4       89.62   41965   41930   42013   F       81.00   90
433     4       84.94   41937   41930   42020   F       81.40   67
433     4       86.87   41944   41930   42020   F       81.40   74
433     4       88.33   41951   41930   42020   F       81.40   81
433     4       88.99   41958   41930   42020   F       81.40   88
433     4       89.25   41965   41930   42020   F       81.40   90
436     4       87.64   41937   41930   42036   F       87.30   67
436     4       88.81   41944   41930   42036   F       87.30   74
436     4       89.17   41951   41930   42036   F       87.30   81
436     4       90.48   41958   41930   42036   F       87.30   88
436     4       90.58   41965   41930   42036   F       87.30   90
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