I have a data frame with 4 groups (defined by categories "a" and "b" in column 1 and categories "X" and "Y" in column 2). I want to rank the attributes in column 3 by their values in column 4, but specifically within the groups in columns 1 and 2 (AX, AY, BX, BY).
How can I go from this:
col1 col2 col3 col4
a X pat 1
b Y dog 2
b X leg 3
a X hog 4
b Y egg 5
a Y log 6
b X map 7
b Y ice 8
b X mat 9
a Y sat 10
to this?
col1 col2 col3 col4
a X hog 4
a X pat 1
a Y sat 10
a Y log 6
b X mat 9
b X map 7
b X leg 3
b Y ice 8
b Y egg 5
b Y dog 2
(example input code below)
col1 <- c('a','b','b','a','b','a','b','b','b','a')
col2 <- c('X','Y','X','X','Y','Y','X','Y','X','Y')
col3 <- c('pat','dog','leg','hog','egg','log','map','ice','mat','sat')
col4 <- c(1,2,3,4,5,6,7,8,9,10)
df <- data.frame(col1,col2,col3,col4)
colA <- c('a','a','a','a','b','b','b','b','b','b')
colB <- c('X','X','Y','Y','X','X','X','Y','Y','Y')
colC <- c('hog','pat','sat','log','mat','map','leg','ice','egg','dog')
colD <- c(4,1,10,6,9,7,3,8,5,2)
df1 <- data.frame(colA,colB,colC,colD)
I tried the following, but it gives a random arrangement that has none of the ranked-within-groups structure that I want:
df %>% group_by(col1, col2) %>% arrange(desc(col4))
df %>% group_by(col1) %>% arrange(col1) %>% group_by(col2) %>% arrange(col2) sorts the data frame correctly by the first two columns, but I can't further arrange it by col4.
For this, we don't need group_by
library(dplyr)
df %>%
arrange(col1, col2, desc(col4))
# col1 col2 col3 col4
#1 a X hog 4
#2 a X pat 1
#3 a Y sat 10
#4 a Y log 6
#5 b X mat 9
#6 b X map 7
#7 b X leg 3
#8 b Y ice 8
#9 b Y egg 5
#10 b Y dog 2
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