Hello everyone, I am a biologist student trying to work with R:

I am trying to do Variables selection with the VSURF function.

FinalData<-VSURF(formula=KI67~.,lmerd,na.action=na.omit)

It turns a warning message:

Thresholding step

Estimated computational time (on one core): 68 sec.

|============================================================================================| 100%

Interpretation step (on 12 variables)

Estimated computational time (on one core): between 3 sec. and 57 sec.

|============================================================================================| 100%

Prediction step (on 6 variables)

Maximum estimated computational time (on one core): 16.5 sec.

|============================================================================================| 100%Warning message:

In VSURF.formula(formula = KI67 ~ ., data = lmerd, na.action = na.omit) :

VSURF with a formula-type call outputs selected variables

which are indices of the input matrix based on the formula:

you may reorder these to get indices of the original data

I would like to know what's the problem please.

Thank you very much