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In my previous post, I introduced how to change variable names within columns. In the post, I provided a simple code to rename variables and also used the stringr package for renaming variables.

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■ How to Rename Variables within Columns in R?

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Today I’ll introduce another code to simply rename variables using dplyr() package.

Name=c("JACK","KATE","BOB","DAVID","MIN")
Country=c("USA","Spain","France","Germany","Korea")
Sex=c("Male","Female","Male","Male","Male")
Table=data.frame (Name, Country, Sex)

print(Table)
   Name Country    Sex
1  JACK     USA   Male
2  KATE   Spain Female
3   BOB  France   Male
4 DAVID Germany   Male
5   MIN   Korea   Male

In my previous post, using the simple data above, I introduced how to rename variables. For example, we can rename variables using the below code.

Table$Country[Table$Country=="Germany"]="Canada" 

print(Table)
   Name Country    Sex
1  JACK     USA   Male
2  KATE   Spain Female
3   BOB  France   Male
4 DAVID  Canada   Male
5   MIN   Korea   Male

Or, using stringr package, we can also rename variables.

if(!require(stringr)) install.packages("stringr")
library (stringr)

Table$Country= str_replace_all (Table$Country, 'USA', 'United States')
Table$Name= str_replace_all (Table$Name, 'KATE', 'Catherine')

print(Table)
       Name       Country    Sex
1      JACK United States   Male
2 Catherine         Spain Female
3       BOB        France   Male
4     DAVID        Canada   Male
5       MIN         Korea   Male

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Now, I’ll introduce another code using dplyr() package.

if (require("dplyr") == F) install.packages("dplyr")
library(dplyr)

Table1= Table %>%
              mutate (Country= case_when(
                      Country== "USA"  ~ "california",
                      Country== "Spain"  ~ "Texas",
                      Country== "France"  ~ "Louisiana",
                      Country== "Germany" ~ "New York",
                      Country== "Korea" ~ "Georgia",
                      TRUE ~ as.character(Country)
  ))

print(Table1)
   Name    Country    Sex
1  JACK california   Male
2  KATE      Texas Female
3   BOB  Louisiana   Male
4 DAVID   New York   Male
5   MIN    Georgia   Male

All variables’ name was change. The column name is country is not correct. I’ll change the column name to State.

colnames(Table1)[2] = c("State")

print(Table1)
   Name      State    Sex
1  JACK california   Male
2  KATE      Texas Female
3   BOB  Louisiana   Male
4 DAVID   New York   Male
5   MIN    Georgia   Male

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