R data.table binary value for last row in group by condition

Question

I have data like this:

library(data.table)
id <- c(\"1232\",\"1232\",\"1232\",\"4211\",\"4211\",\"4211\")
conversion <- c(0,0,0,1,1,1)
DT <- data.ta         


        

Answer 1

Have you tried something like the following?

library(tidyverse)

final_conversion_dat <- DT %>% 
  group_by(id) %>% 
  mutate(date = as.Date(date),
         final_conversion = ifelse(date == max(date, na.rm = T) & conversion == 1, 1, 0))