我需要将一个数据帧的每一行与另一数据帧的每一行进行比较：
id first_name last_name account_nr amount currency comment
1 wW3A4QgpQQd Lynnett Labadini ES46 2569 1625 6669 5490 4624 9655.56 JPY Z617
2 LsoPIXEMOo5 Velvet Ritelli FR60 4478 1591 96PB SIMI FSTO L13 6992.36 PHP L841
3 L2wBds77Pw8 orv matfin LB61 6941 CQYE ONER G5T0 KNDU JU5H 6184.38 CAD o705
4 ME4O9MKlOzO ring hecks BG28 JYPB 4068 09NB FQ7I 6C 4203.54 IDR Y548
5 d83N7Viwq8k judd Riddick IL36 2200 2898 6944 4508 084 3619.43 IDR O762
6 1l96680epEy Edouard Kapovski IS73 1064 6186 1231 6178 3743 49 5291.76 BRL T397
7 7JwvD23oMzC Jake Rabinovich KZ80 759G VOHS JHBY L5TY 6994.26 NGN Y784
8 ZOcg2uprlN6 vere gravener SE39 1416 1830 7878 5026 6805 5281.18 UAH Z890
9 AUrx3nYR2Ks Bob Kelso VS41 5146 7748 1278 5362 4324.12 USD W312
10 VrDS+DqRG4S1 Mitch Mitchell AT65 6306 7334 7478 1908 4221.59 EUR T352
另一个
id first_name last_name amount currency comment recipient
1 xGZx1tNE4oa Lynnett Labadini 9655.56 JPY Z617 72
2 nV7NtxiguPQ Velvet Ritelli 6992.36 PHP L841 175
3 Rto0EHOR17k Orv Matfin 6184.38 CAD O705 412
4 2VDMHTJnxcw Ring Hecks 4203.54 IDR Y548 63
5 VQI7I0EZf1q Judd Riddick 3619.43 IDR O163 39
6 w835JEfmJvZ Edouard Avramovic 5291.76 BRL T397 240
7 of2FZZXFKY8 Ferdy Petracchi 6994.26 NGN Y784 102
8 XgUZFhKowB1 Vere Gravener 5281.18 IDR U024 111
9 iGO9advyXP3 Temp McKeevers 7364.49 TND R404 327
10 5BCiYQVhfxM Arnie Ashdown 4221.59 ZAR N988 262
我想用tidyverse来做，但是另一种方式也是可以接受的。我不想使用循环。 ID中没有匹配项。任务是在first_name, last_name, amount, currency, comment列上进行模糊连接。我看到的一种方法是，将第一个数据帧的每一行nrow的时间分布在另一个数据行中，并使用map，但是我认为这在内存效率方面非常低。
答案 0 :(得分：1)
使用fuzzyjoin查看我的解决方案。基本上，它确实将左侧的每一行都散布在右侧的每一行中，因为我设置了高（10）max_dist，但是如果您无论如何都不希望不良匹配，则可以降低它。然后，它使用group_by和top_n为第一个数据帧中的每个first_name和last_name选择最佳匹配。
我添加了您的“不匹配”和“标签”条件（请参见前两列）。您可以调整匹配函数的选项（现在，它使用特定的stringdist方法Levenshtein比较指定的五列的字符串距离）。
此外，鲍勃·凯尔索（Bob Kelso）出现了两次，因为最佳匹配被绑在2个（不良）匹配之间，因此算法无法选择同样糟糕的匹配之一。
library(tidyverse); library(fuzzyjoin)
# Load data
df1 <- tibble::tribble(
~id, ~first_name, ~last_name, ~account_nr, ~amount, ~currency, ~comment,
"wW3A4QgpQQd", "Lynnett", "Labadini", "ES46 2569 1625 6669 5490 4624", 9655.56, "JPY", "Z617",
"LsoPIXEMOo5", "Velvet", "Ritelli", "FR60 4478 1591 96PB SIMI FSTO L13", 6992.36, "PHP", "L841",
"L2wBds77Pw8", "orv", "matfin", "LB61 6941 CQYE ONER G5T0 KNDU JU5H", 6184.38, "CAD", "o705",
"ME4O9MKlOzO", "ring", "hecks", "BG28 JYPB 4068 09NB FQ7I 6C", 4203.54, "IDR", "Y548",
"d83N7Viwq8k", "judd", "Riddick", "IL36 2200 2898 6944 4508 084", 3619.43, "IDR", "O762",
"1l96680epEy", "Edouard", "Kapovski", "IS73 1064 6186 1231 6178 3743 49", 5291.76, "BRL", "T397",
"7JwvD23oMzC", "Jake", "Rabinovich", "KZ80 759G VOHS JHBY L5TY", 6994.26, "NGN", "Y784",
"ZOcg2uprlN6", "vere", "gravener", "SE39 1416 1830 7878 5026 6805", 5281.18, "UAH", "Z890",
"AUrx3nYR2Ks", "Bob", "Kelso", "VS41 5146 7748 1278 5362", 4324.12, "USD", "W312",
"VrDS+DqRG4S1", "Mitch", "Mitchell", "AT65 6306 7334 7478 1908", 4221.59, "EUR", "T352"
)
df2 <- tibble::tribble(
~id, ~first_name, ~last_name, ~amount, ~currency, ~comment, ~recipient,
"xGZx1tNE4oa", "Lynnett", "Labadini", 9655.56, "JPY", "Z617", 72,
"nV7NtxiguPQ", "Velvet", "Ritelli", 6992.36, "PHP", "L841", 175,
"Rto0EHOR17k", "Orv", "Matfin", 6184.38, "CAD", "O705", 412,
"2VDMHTJnxcw", "Ring", "Hecks", 4203.54, "IDR", "Y548", 63,
"VQI7I0EZf1q", "Judd", "Riddick", 3619.43, "IDR", "O163", 39,
"w835JEfmJvZ", "Edouard", "Avramovic", 5291.76, "BRL", "T397", 240,
"of2FZZXFKY8", "Ferdy", "Petracchi", 6994.26, "NGN", "Y784", 102,
"XgUZFhKowB1", "Vere", "Gravener", 5281.18, "IDR", "U024", 111,
"iGO9advyXP3", "Temp", "McKeevers", 7364.49, "TND", "R404", 327,
"5BCiYQVhfxM", "Arnie", "Ashdown", 4221.59, "ZAR", "N988", 262
)
# Solution using fuzzyjoin
stringdist_left_join(df1, df2, by = c("first_name", "last_name", "amount", "currency", "comment"),
max_dist = 10, ignore_case = TRUE, method = "lv", distance_col = "dist") %>%
mutate(total.dist = first_name.dist + last_name.dist + amount.dist + currency.dist + comment.dist) %>%
group_by(first_name.x, last_name.x) %>%
top_n(-1, total.dist) %>%
mutate(mismatch = (first_name.dist>0) + (last_name.dist>0) + (amount.dist>0) + (currency.dist>0) + (comment.dist>0),
label = case_when(mismatch == 0 ~ "match",
mismatch == 1 ~ "high",
mismatch == 2 ~ "proposed",
mismatch > 2 ~ "none",
TRUE ~ "")) %>%
select(label, mismatch, total.dist, everything())
#> # A tibble: 11 x 22
#> # Groups: first_name.x, last_name.x [10]
#> label mismatch total.dist id.x first_name.x last_name.x account_nr
#> <chr> <int> <dbl> <chr> <chr> <chr> <chr>
#> 1 match 0 0 wW3A~ Lynnett Labadini ES46 2569~
#> 2 match 0 0 LsoP~ Velvet Ritelli FR60 4478~
#> 3 match 0 0 L2wB~ orv matfin LB61 6941~
#> 4 match 0 0 ME4O~ ring hecks BG28 JYPB~
#> 5 high 1 2 d83N~ judd Riddick IL36 2200~
#> 6 high 1 7 1l96~ Edouard Kapovski IS73 1064~
#> 7 prop~ 2 14 7Jwv~ Jake Rabinovich KZ80 759G~
#> 8 prop~ 2 7 ZOcg~ vere gravener SE39 1416~
#> 9 none 5 20 AUrx~ Bob Kelso VS41 5146~
#> 10 none 5 20 AUrx~ Bob Kelso VS41 5146~
#> 11 none 4 19 VrDS~ Mitch Mitchell AT65 6306~
#> # ... with 15 more variables: amount.x <dbl>, currency.x <chr>,
#> # comment.x <chr>, id.y <chr>, first_name.y <chr>, last_name.y <chr>,
#> # amount.y <dbl>, currency.y <chr>, comment.y <chr>, recipient <dbl>,
#> # amount.dist <dbl>, comment.dist <dbl>, currency.dist <dbl>,
#> # first_name.dist <dbl>, last_name.dist <dbl>
由reprex package（v0.2.1）于2019-03-17创建