[R] need descriptive help

[arun]

Hi,

Oops! I selected the wrong columns in the previous reply.
Try this:

 set.seed(1)
 
 dat2<-data.frame(patient=rep(c(1:20),5),cost=rnorm(100,15,1))
 agg1<-aggregate(dat2,by=list(dat2$patient),FUN=sum)
  agg2<-agg1$cost> 75
 agg3<-data.frame(agg1[agg2,c(1,3)])
 names(agg3)<-c("patient","cost")
 agg3






----- Original Message -----
From: mkm1616 <mkm1616 at gmail.com>
To: r-help at r-project.org
Cc: 
Sent: Tuesday, June 5, 2012 11:34 AM
Subject: [R] need descriptive help

Hi all, I'm new to using R, and apologize for simplicity of this
question.

I'm using a data set with over 60,000 observations, Two variables are
patient ID, and cost incurred by the patient.  I'd like to generate
frequency/table by patient and cost IF the total cost is over 2000.

Right now I'm using:

by(x$cost, x$patient, sum)

but this generates a huge list for each patient.

What is the best way to either (1) export the output into a csv so I
can visually inspect each patient or more helpful (2) create the table
IF sum of cost > 1000

Thanks!

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