Not a member

Now that you've practiced identifying membership constraint problems, it's time to fix these problems in a new dataset. Throughout this chapter, you'll be working with a dataset called sfo_survey, containing survey responses from passengers taking flights from San Francisco International Airport (SFO). Participants were asked questions about the airport's cleanliness, wait times, safety, and their overall satisfaction.

There were a few issues during data collection that resulted in some inconsistencies in the dataset. In this exercise, you'll be working with the dest_size column, which categorizes the size of the destination airport that the passengers were flying to. A data frame called dest_sizes is available that contains all the possible destination sizes. Your mission is to find rows with invalid dest_sizes and remove them from the data frame.

dplyr has been loaded and sfo_survey and dest_sizes are available.

Cet exercice fait partie du cours

Cleaning Data in R

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Exercice interactif pratique

Essayez cet exercice en complétant cet exemple de code.

# Count the number of occurrences of dest_size
sfo_survey %>%
  count(___)

Modifier et exécuter le code

Cet exercice fait partie du cours

Cleaning Data in R

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In this chapter, you'll learn how to overcome some of the most common dirty data problems. You'll convert data types, apply range constraints to remove future data points, and remove duplicated data points to avoid double-counting.

Exercise 1: Data type constraints Exercise 2: Common data types Exercise 3: Converting data types Exercise 4: Trimming strings Exercise 5: Range constraints Exercise 6: Ride duration constraints Exercise 7: Back to the future Exercise 8: Uniqueness constraints Exercise 9: Full duplicates Exercise 10: Removing partial duplicates Exercise 11: Aggregating partial duplicates

Categorical and text data can often be some of the messiest parts of a dataset due to their unstructured nature. In this chapter, you’ll learn how to fix whitespace and capitalization inconsistencies in category labels, collapse multiple categories into one, and reformat strings for consistency.

Exercise 1: Checking membership Exercise 2: Members only Exercise 3: Not a member

Exercice en cours

Exercise 4: Categorical data problems Exercise 5: Identifying inconsistency Exercise 6: Correcting inconsistency Exercise 7: Collapsing categories Exercise 8: Cleaning text data Exercise 9: Detecting inconsistent text data Exercise 10: Replacing and removing Exercise 11: Invalid phone numbers

In this chapter, you’ll dive into more advanced data cleaning problems, such as ensuring that weights are all written in kilograms instead of pounds. You’ll also gain invaluable skills that will help you verify that values have been added correctly and that missing values don’t negatively impact your analyses.

Exercise 1: Uniformity Exercise 2: Date uniformity Exercise 3: Currency uniformity Exercise 4: Cross field validation Exercise 5: Validating totals Exercise 6: Validating age Exercise 7: Completeness Exercise 8: Types of missingness Exercise 9: Visualizing missing data Exercise 10: Treating missing data

Record linkage is a powerful technique used to merge multiple datasets together, used when values have typos or different spellings. In this chapter, you'll learn how to link records by calculating the similarity between strings—you’ll then use your new skills to join two restaurant review datasets into one clean master dataset.

Exercise 1: Comparing strings Exercise 2: Calculating distance Exercise 3: Small distance, small difference Exercise 4: Fixing typos with string distance Exercise 5: Generating and comparing pairs Exercise 6: Link or join?Exercise 7: Pair blocking Exercise 8: Comparing pairs Exercise 9: Scoring and linking Exercise 10: Score then select or select then score?Exercise 11: Putting it together Exercise 12: Congratulations!