How can R combine data with the same ID?

In R language, we can merge data with the same id using the merge() function or the left_join() function in the dplyr package.

1. combine()

Assuming there are two data frames, df1 and df2, with the same id column, you can merge them using the following code:

merged_data <- merge(df1, df2, by = "id")

In this case, df1 and df2 are the data frames to be merged, with “id” as the common column name.

1. dplyr is a package used in R for data manipulation.
2. Combine two data frames by keeping all rows from the first dataframe and only including matching rows from the second dataframe.

Firstly, you will need to install the dplyr package. After that, you can merge data with the same ID using the following code.

library(dplyr)

merged_data <- left_join(df1, df2, by = "id")

In this case, df1 and df2 are the data frames to be merged, with “id” as the common column name. The left_join() function is used here to preserve all rows from df1.

Both the merge() function and the left_join() function can be used to choose the merging method and parameters according to the needs.