Below are my two dataframes, df1 and df2 df1 <- data.frame(id=c("632592651","633322173","634703802","634927873","635812953","636004739","636101211","636157799","636263106","636752420"),text=c("asdf","cat","dog","mouse","elephant","goose","rat","mice","kitty","kitten"),response=c("y","y","y","n","n","y","y","n","n","y")) id text response 1 632592651 asdf y 2 633322173 cat y 3 634703802 dog y 4 634927873 mouse n 5 635812953 elephant n 6 636004739 goose y 7 636101211 rat y 8 636157799 mice n 9 636263106 kitty n 10 636752420 kitten y df2… Read More How to return row values that match column 'id' in both df1 and df2 but not column 'text' and return NA to the mismatch in column 'text'?