[R] different result from the same errorest() in library( ipred)

[Liu, Xin]

Dear all,

Does anybody can explain this: different results got when all the same parameters are used in the errorest() in library ipred, as the following?

errorest(Species ~ ., data=iris, model=randomForest, estimator = "cv", est.para=control.errorest(k=3),  mtry=2)$err 
[1] 0.03333333
> errorest(Species ~ ., data=iris, model=randomForest, estimator = "cv", est.para=control.errorest(k=3),  mtry=2)$err 
[1] 0.04
> errorest(Species ~ ., data=iris, model=randomForest, estimator = "cv", est.para=control.errorest(k=3),  mtry=2)$err 
[1] 0.05333333
> errorest(Species ~ ., data=iris, model=randomForest, estimator = "cv", est.para=control.errorest(k=3),  mtry=2)$err 
[1] 0.05333333
> errorest(Species ~ ., data=iris, model=randomForest, estimator = "cv", est.para=control.errorest(k=3),  mtry=2)$err 
[1] 0.04666667
> errorest(Species ~ ., data=iris, model=randomForest, estimator = "cv", est.para=control.errorest(k=3),  mtry=2)$err 
[1] 0.05333333
> errorest(Species ~ ., data=iris, model=randomForest, estimator = "cv", est.para=control.errorest(k=3),  mtry=2)$err 
[1] 0.04
> 

Xin LIU

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