[R] Sorting dataframe by number of occurrences of factor

From: adigs <andrewdigby_at_mac.com>
Date: Fri, 29 Apr 2011 23:17:58 -0700 (PDT)

Apologies for what's probably quite simple, but I'm having some problems with sorting a data frame by the number of occurences of each level of a factor.


I want to sort the dataframe so that the values of df$name that occur most often are at the bottom - ie. in the order:

attributes(sort(summary(df$name)))$name = "e" "f" "g" "c" "d" "a" "b":

> sort(summary(df$name))

e f g c d a b
1 1 1 3 3 5 6

So the desired result is:

id name
8 e
17 f
20 g
 4 c
11 c
19 c
 6 d
 9 d
10 d
  1 a
  5 a
12 a
14 a
15 a
  2 b
  3 b
  7 b
13 b
16 b
18 b

Any suggestions would be greatly appreciated.


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Received on Sat 30 Apr 2011 - 08:46:29 GMT

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