[R] calibration/validation sets

Liaw, Andy andy_liaw at merck.com
Sun Aug 15 03:05:22 CEST 2004

There are many ways to do this.  One example, supposing your data is in

## randomly pick 1/3 for validation:
valid.idx <- sample(nrow(myData), round(nrow(myData)/3), replace=FALSE) 

## training set:
myData.tr <- myData[-valid.idx,]
## validation set:
myData.valid <- myData[valid.idx,]


> From: Peyuco Porras Porras .
> Hi; 
> Does anyone know how to create a calibration and validation 
> set from a particular dataset? I have a dataframe with nearly 
> 20,000 rows! and I would like to select (randomly) a subset 
> from the original dataset (...I found how to do that) to use 
> as calibration set. However, I don't know how to remove this 
> "calibration" set from the original dataframe in order to get 
> my "validation" set.....Any hint will be greatly appreciated. 
> TT
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