Thanks very much; with your tips, I was able to get the nested ifelse statement
to work properly!
Courtney Benjamin
From: PIKAL Petr
Sent: Thursday, August 10, 2017 5:39 AM
To: Courtney Benjamin; r-help@r-project.org
Subject: RE: Creating New Variable U
Hi
see in line
> -Original Message-
> From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Courtney
> Benjamin
> Sent: Thursday, August 10, 2017 5:55 AM
> To: r-help@r-project.org
> Subject: [R] Creating New Variable Using Ifelse
>
> Hello R Help List,
>
> I am an R novice and
> On 10 Aug 2017, at 06:54, Courtney Benjamin wrote:
>
> Hello R Help List,
>
> I am an R novice and trying to use the ifelse function to create a new binary
> variable based off of the responses of two other binary variables; NAs are
> involved. I pulled it off almost successfully, but when
Hi
> -Original Message-
> From: r-help-boun...@r-project.org [mailto:r-help-bounces@r-
> project.org] On Behalf Of Niklas Fischer
> Sent: Thursday, September 20, 2012 11:13 PM
> To: r-help@r-project.org
> Subject: [R] creating new variable
>
> Dear R-helper
>
> I have a data which is ab
Hi:
Since you tried several functions (reasonably so IMO), here is how
they would work in this problem, in addition to the solutions already
supplied.
Some data massaging before starting, taking your data as input, saved
into an object named visits:
visits <- structure(list(unique_id = c(1L, 1L,
Try this:
require(zoo)
lvd <- tapply(df$visit_date, df$unique_id, max)
index <- tapply(df$visit_date, df$unique_id)
df$last_visit_date <- as.Date(lvd[index])
Jean
Kathleen Rollet wrote on 08/24/2011 04:15:45 PM:
>
> Dear R users,
>
> I am encoutering the following problem: I have a dataset wit
On Aug 24, 2011, at 5:15 PM, Kathleen Rollet wrote:
Dear R users,
I am encoutering the following problem: I have a dataset with a
'unique_id' and different 'visit_date' (formatted as.Date, "%d/%m/
%Y") per unique_id. I would like to create a new variable with the
most recent date of visit
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