Mislabeled NA values

• read_csv() default: only empty strings ("") = NA
• favourite.food has "N/A" (character), let’s treat as NA

students <- read_csv("data/students.csv", na = c("N/A", ""))

students

## # A tibble: 6 × 5
##   `Student ID` `Full Name`      favourite.food     mealPlan            AGE  
##          <dbl> <chr>            <chr>              <chr>               <chr>
## 1            1 Sunil Huffmann   Strawberry yoghurt Lunch only          4    
## 2            2 Barclay Lynn     French fries       Lunch only          5    
## 3            3 Jayendra Lyne    <NA>               Breakfast and lunch 7    
## 4            4 Leon Rossini     Anchovies          Lunch only          <NA> 
## 5            5 Chidiegwu Dunkel Pizza              Breakfast and lunch five 
## 6            6 Güvenç Attila    Ice cream          Lunch only          6