Hi Kisook,
tapply should do the job.
tapply(x,y,mean)
Huub Jan
-----Original Message-----
From: Yoo, Kisook {PD B~Nutley} [mailto:kisook.yoo@roche.com]
Sent: Tuesday, 28 December, 2004 17:19
To: s-news@lists.biostat.wustl.edu
Subject: [S] simple S+ question
Importance: High
Hi,
Could you tell me how to add a variable of mean of X variable by Y
variable?
Thank you.
K.
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