Group by similar results in R

Question

I want to group_by similar results (not unique) and I don\'t know how to do it.

I mean, I have a df with a column called \'name\' that has similar results like: ARPO, AR

Answer 1

The function below uses agrepl to get similar strings, given a threshold thresh. And returns an integer vector of positions where the first in a group was found.

The test data is the data in NoeliaNC's answer.

library(dplyr)

similarGroups <- function(x, thresh = 0.8){
  grp <- integer(length(x))
  name <- x
  for(i in seq_along(name)){
    if(!is.na(name[i])){
      sim <- agrepl(x[i], x, ignore.case = TRUE, max.distance = 1 - thresh)
      k <- which(sim & !is.na(name))
      grp[k] <- i
      is.na(name) <- k
    }
  }
  grp
}

similarGroups(df[['name']])
# [1] 1 1 1 1 1 6 6 8 8 6 8 8 6 1 1 8 1 6 6 6 1 8 1 8 1

Now apply the function to grouping the dataframe.

df %>%
  mutate(group = name[similarGroups(name)]) %>%
  count(group)
## A tibble: 3 x 2
#  group     n
#   
#1 ARPO     11
#2 BBBBB     7
#3 JJJJ      7

Edit

Another way is to use the stringsim function in package stringdist. It features several distance/similarity measures, that can be tested to see which one gives better results.

similarGroups2 <- function(x, thresh = 0.8, method = "soundex"){
  grp <- integer(length(x))
  name <- x
  x <- tolower(x)
  for(i in seq_along(name)){
    if(!is.na(name[i])){
      sim <- stringdist::stringsim(x[i], x, method = method)
      k <- which(sim > thresh & !is.na(name))
      grp[k] <- i
      is.na(name) <- k
    }
  }
  grp
}

df %>%
   mutate(group = name[similarGroups2(name, thresh = 0.7, method = "jw")]) %>%
   count(group)
## A tibble: 4 x 2
#  group             n
#           
#1 Antonio Gomez     3
#2 ARPO             11
#3 BBBBB             7
#4 JJJJ              7

New data

df <- tibble::tribble(
  ~name,       ~number,       ~ind,
  'Antonio Gomez', 1234,       1,
  'Antonio Sanches', 5678,     2,
  'Antonio Ruiz',  9089,       3,
  "ARPO",      "405162",      5,
  "ARPO S.L.", "504653",      22,
  "ARPOS",     "900232",      1,
  "ARPO",      "504694",      12,
  "ARPO",      "400304",      42,
  "JJJJ",      "401605",      2,
  "JJJJ",      "900029",      31,
  "BBBBB",     "400090",      25,
  "BBBBB",     "403004",      33,
  "JJJJ",      "900222",      2,
  "BBBBB",     "403967",      11,
  "BBBB",      "400304",      52,
  "JJJJ",      "404308",      200,
  "ARPO",      "403898",      2,
  "ARPO",      "158159",      24,
  "BBBBBBB",   "700805",      2,
  "ARPO S.L.", "900245",      24,
  "JJJJ",      "501486",      2,
  "JJJJ",      "400215",      210,
  "JJJJ",      "504379",      26,
  "HARPO",     "900222",      400,
  "BBBBB",     "109700",      46,
  "ARPO",      "142173",      14,
  "BBBBB",     "400586",      22,
  "ARPO",      "401605",      322
)