Invalid phone numbers
The customer support team is grateful for your work so far, but during their first day of calling participants, they ran into some phone numbers that were invalid. In this exercise, you'll remove any rows with invalid phone numbers so that these faulty numbers don't keep slowing the team down.
dplyr and stringr are loaded and sfo_survey is available.
This exercise is part of the course
Cleaning Data in R
Exercise instructions
- Examine the invalid
phonenumbers by filtering for numbers whose length is not equal to 12. - Remove the rows with invalid numbers by filtering for numbers with a length of exactly 12.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
# Check out the invalid numbers
sfo_survey %>%
filter(___)
# Remove rows with invalid numbers
sfo_survey %>%
___