How to select the row with the maximum value in each group
In a dataset with multiple observations for each subject I want to take a subset with only the maximum data value for each record. For example, with a following dataset:
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Since {dplyr} v1.0.0 (May 2020) there is the new
slice_*syntax which supersedestop_n().See also https://dplyr.tidyverse.org/reference/slice.html.
library(tidyverse) ID <- c(1,1,1,2,2,2,2,3,3) Value <- c(2,3,5,2,5,8,17,3,5) Event <- c(1,1,2,1,2,1,2,2,2) group <- data.frame(Subject=ID, pt=Value, Event=Event) group %>% group_by(Subject) %>% slice_max(pt) #> # A tibble: 3 x 3 #> # Groups: Subject [3] #> Subject pt Event #>#> 1 1 5 2 #> 2 2 17 2 #> 3 3 5 2 Created on 2020-08-18 by the reprex package (v0.3.0.9001)
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