Add new variable to Dataframe that matching previews variables values


I need some help with a a dataframe manipulation. I have two variables that have the same subsets. Each come in a .csv document.
I need to put them to match the subsets. I've tried using the arrange from tidyverse function on each separate df to make it match, but the real data base is hundreds of rows for each .csv.

For example. I need that the value of variable Price, for Company 1, for food items sold to North region matches the value of variable freights of company 1, food, North. And so on and so forth.

I'd really appreciate any help with this.

One approach would be to combine these data sets using a join. In the example below, each .csv file is read in and the Value columns are renamed to Price and Freight, respectively (I then give sample data sets of what each of these results would look like, which can be ignored in practice). Then, use a left_join() to combine the two sets. As shown, these sets combine on Reg, Type, and Company. The result is a data set with columns for Price and Freight.


# read in .csv files and rename
price_df = read_csv('path to your price.csv') %>%
  rename(Price = Value)

freight_df = read_csv('path to your freight.csv') %>%
  mutate(Freight = Value)

# sample data set of what would be read in above
price_df = data.frame(
  Reg = c('North', 'North', 'North', 'North', 'South', 'South'),
  Type = c('Food', 'Food', 'Clothes', 'Clothes', 'Food', 'Food'),
  Company = c(1, 2, 1, 2, 1, 2),
  Price = c(0.992, 1.176, .992, 1.029, 0.911, 0.995)

# sample data set of what would be read in above
freight_df = data.frame(
  Company = c(1, 1, 1, 1, 
              2, 2, 2, 2),
  Reg = c('North', 'North', 'South', 'South',
          'North', 'North', 'South', 'South'),
  Type = c('Food', 'Clothes', 'Food', 'Clothes',
           'Food', 'Clothes', 'Food', 'Clothes'),
  Freight = c(10, 15, 13, 24,
              15, 15, 15, 16)

# join
out = left_join(price_df, freight_df)
#> Joining, by = c("Reg", "Type", "Company")

#>     Reg    Type Company Price Freight
#> 1 North    Food       1 0.992      10
#> 2 North    Food       2 1.176      15
#> 3 North Clothes       1 0.992      15
#> 4 North Clothes       2 1.029      15
#> 5 South    Food       1 0.911      13
#> 6 South    Food       2 0.995      15

Created on 2022-10-24 with reprex v2.0.2.9000


Hello scotty!

I implemented your solution and it worked like a charm.

Thank you very much for your help!

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