Hi,
Using ddply,
ddply(df, .(ID), mutate, nrows=length(rel.head), test = nrows==2 &
all(rel.head %in% c(1,3)))
HTH,
baptiste
On 5 October 2011 06:02, Dennis Murphy wrote:
> Hi:
>
> Here's another way to do it with the plyr package, also not terribly
> elegant. It assumes that rel.head is a f
Hi:
Here's another way to do it with the plyr package, also not terribly
elegant. It assumes that rel.head is a factor in your original data
frame:
> str(df)
'data.frame': 11 obs. of 2 variables:
$ ID : Factor w/ 6 levels "17100","17101",..: 1 1 2 3 4 4 5 5 5 6 ...
$ rel.head: Factor w/
$ID%in%ids)
cbind(df,added.dummy)
Martyn
-Original Message-
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org]
On Behalf Of gra...@stat.columbia.edu
Sent: 04 October 2011 16:45
To: r-help@r-project.org
Subject: [R] adding a dummy variable...
Hi all,
I have a datas
Hi all,
I have a dataset of individuals where the variable ID corresponds to the
identification of the household where the individual lives. rel.head stands
for the relationship with the household head. so rel.head=1 is the household
head, rel.head=2 is the spouse, rel.head=3 is the children.
Her
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