[R] Splitting data into test and train (80:20) kepping attributes similar

[Dwaipayan Dasgupta]

Hi,
Could someone help me with this please , im trying to use 
Y = Attrition_data[,1] # extract labels from the data 
 msk = sample.split (Y, SplitRatio=3/4)
  table(Y,msk) 
to do the splitting but it keeps throwing up and error 
 Error: could not find function "sample.split"
Could you please help

Thanks in advance
doy


-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Dwaipayan Dasgupta
Sent: Tuesday, April 24, 2012 9:08 PM
To: r-help at r-project.org
Subject: [R] Splitting data into test and train (80:20) kepping attributes similar

Hi,
I am trying to do some predictive modeling around attrition and want to split the dataset into test and train (80:20) and keep the ratio of attritees:non attrites same.
In my dataset the attrition indicator is coded as 0(for non-attritees) and 1 (for attritees) and I want to keep the ratio of 0's to 1 similar.
I apologize for this trivial question but this is my second week with R.

Thanks,
Doy





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American Express made the following annotations on Wed Apr 25 2012 03:39:08

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Ce courrier et toute pièce jointe qu'il contient sont réservés au seul destinataire indiqué et peuvent renfermer des renseignements confidentiels et privilégiés. Si vous n'êtes pas le destinataire prévu, toute divulgation, duplication, utilisation ou distribution du courrier ou de toute pièce jointe est interdite. Si vous avez reçu cette communication par erreur, veuillez nous en aviser par courrier et détruire immédiatement le courrier et les pièces jointes. Merci. 

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