Hi,
I am stuck with creating a conditional categorical variable in R
If my dataframe  data_2  has 3 variables A,B,C    I want to create variable D which would be something like :

data_2$D <- ifelse(data_2$A < data_2$B & promotion_ind =="N",1,0),
this throws up an error "In Ops.factor(data_2$A,data_2$B) :
  < not meaningful for factors

I have tried converting the dataframe to a matrix using
data.matrix(data_2, rownames.force = NA) but that did not help,

Can anybody tell me how to go about doing this?

Thanks in advance,
Doy

American Express made the following annotations on Wed Apr 18 2012 05:37:16 

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

"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 ajouté le commentaire suivant le Wed Apr 18 2012 05:37:16 

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. 

****************************************************************************** 
-------------------------------------------------------------------------------


	[[alternative HTML version deleted]]

