你可以使用这个stringdist
包。下面的函数将根据项目到不同的距离correct
更正in file2 。Commodity.Name
CName
然后 aleft_join
用于连接两个表。
我还注意到,如果我使用stringdistmatrix
. 您可以尝试更改weight
参数以stringdistmatrix
获得更好的校正结果。
> library(dplyr)
> library(stringdist)
>
> file1 <- read.csv("/Users/Randy/Desktop/file1.csv")
> file2 <- read.csv("/Users/Randy/Desktop/file2.csv")
>
> head(file1)
Sl.No. Commodity.Category Commodity.Name
1 1 Stationary Pencil
2 2 Stationary Pen
3 3 Stationary Marker
4 4 Office Utensils Chair
5 5 Office Utensils Drawer
6 6 Hardware Monitor
> head(file2)
Sl.No. Commodity.Name
1 1 Pancil
2 2 Pencil-HB 02
3 3 Pencil-Apsara
4 4 Pancil-Nataraj
5 5 Pen-Parker
6 6 Pen-Reynolds
>
> CName <- levels(file1$Commodity.Name)
> correct <- function(x){
+ factor(sapply(x, function(z) CName[which.min(stringdistmatrix(z, CName, weight=c(1,0.1,1,1)))]), CName)
+ }
>
> correctedfile2 <- file2 %>%
+ transmute(Commodity.Name.Old = Commodity.Name, Commodity.Name = correct(Commodity.Name))
>
> correctedfile2 %>%
+ inner_join(file1[,-1], by="Commodity.Name")
Commodity.Name.Old Commodity.Name Commodity.Category
1 Pancil Pencil Stationary
2 Pencil-HB 02 Pencil Stationary
3 Pencil-Apsara Pencil Stationary
4 Pancil-Nataraj Pencil Stationary
5 Pen-Parker Pen Stationary
6 Pen-Reynolds Pen Stationary
7 Monitor-X001RL Monitor Hardware
如果您需要“其他”类别,您只需要使用权重即可。我在 file2 中添加了一行“Diesel”。然后使用自定义权重计算分数stringdist
(您应该尝试改变值)。如果分数大于 2(这个值与权重的分配方式有关),它不会纠正任何事情。
PS:由于我们不知道所有可能的标签,我们必须做对as.character
流到.factor
character
PS2:我也tolower
用于不区分大小写的评分。
> head(file2)
Sl.No. Commodity.Name
1 1 Diesel
2 2 Pancil
3 3 Pencil-HB 02
4 4 Pencil-Apsara
5 5 Pancil-Nataraj
6 6 Pen-Parker
>
> CName <- levels(file1$Commodity.Name)
> CName.lower <- tolower(CName)
> correct_1 <- function(x){
+ scores = stringdistmatrix(tolower(x), CName.lower, weight=c(1,0.001,1,0.5))
+ if (min(scores)>2) {
+ return(x)
+ } else {
+ return(as.character(CName[which.min(scores)]))
+ }
+ }
> correct <- function(x) {
+ sapply(as.character(x), correct_1)
+ }
>
> correctedfile2 <- file2 %>%
+ transmute(Commodity.Name.Old = Commodity.Name, Commodity.Name = correct(Commodity.Name))
>
> file1$Commodity.Name = as.character(file1$Commodity.Name)
> correctedfile2 %>%
+ left_join(file1[,-1], by="Commodity.Name")
Commodity.Name.Old Commodity.Name Commodity.Category
1 Diesel Diesel <NA>
2 Pancil Pencil Stationary
3 Pencil-HB 02 Pencil Stationary
4 Pencil-Apsara Pencil Stationary
5 Pancil-Nataraj Pencil Stationary
6 Pen-Parker Pen Stationary
7 Pen-Reynolds Pen Stationary
8 Monitor-X001RL Monitor Hardware