R help - Apr 2012 - 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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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





American Express made the following annotations on Tue Apr 24 2012 08:38:50 

******************************************************************************

"This message and any attachments are solely for the intended recipient and
may contain confidential or privileged information. If you are not the intended
recipient, any disclosure, copying, use, or distribution of the information
included in this message and any attachments is prohibited. If you have received
this communication in error, please notify us by reply e-mail and immediately
and permanently delete this message and any attachments. Thank you."

American Express a ajout? le commentaire suivant le Tue Apr 24 2012 08:38:50 

Ce courrier et toute pi?ce jointe qu'il contient sont r?serv?s au seul
destinataire indiqu? et peuvent renfermer des renseignements confidentiels et
privil?gi?s. Si vous n'?tes pas le destinataire pr?vu, toute divulgation,
duplication, utilisation ou distribution du courrier ou de toute pi?ce jointe
est interdite. Si vous avez re?u cette communication par erreur, veuillez nous
en aviser par courrier et d?truire imm?diatement le courrier et les pi?ces
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American Express made the following annotations on Wed Apr 25 2012 03:39:08

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included in this message and any attachments is prohibited. If you have received
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and permanently delete this message and any attachments. Thank you."

American Express a ajout? le commentaire suivant le Wed Apr 25 2012 03:39:08 

Ce courrier et toute pi?ce jointe qu'il contient sont r?serv?s au seul
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