Re: [R] Creating New Variable Using Ifelse

Using Ifelse 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

Re: [R] Creating New Variable Using Ifelse

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,

Re: [R] Creating New Variable Using Ifelse

> 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

[R] Creating New Variable Using Ifelse

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 I checked the counts of my new variable for accuracy, I found that

Re: [R] creating new variable

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 >

Re: [R] Creating new variable with maximum visit date by group_id

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,

Re: [R] Creating new variable with maximum visit date by group_id

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

Re: [R] Creating new variable with maximum visit date by group_id

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

[R] Creating new variable with maximum visit date by group_id

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 per unique_id as shown below. unique_id visit_date