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It's commonly said that data scientists spend 80% of their time cleaning and manipulating data and only 20% of their time analyzing it. The time spent cleaning is vital since analyzing dirty data can lead you to draw inaccurate conclusions. Data cleaning is an essential task in data science. Without properly cleaned data, the results of any data analysis or machine learning model could be inaccurate. In this course, you will learn how to identify, diagnose, and treat a variety of data cleaning problems in Python, ranging from simple to advanced. You will deal with improper data types, check that your data is in the correct range, handle missing data, perform record linkage, and more!
Common data problemsFree
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.Data type constraints50 xpCommon data types100 xpNumeric data or ... ?100 xpSumming strings and concatenating numbers100 xpData range constraints50 xpTire size constraints100 xpBack to the future100 xpUniqueness constraints50 xpHow big is your subset?50 xpFinding duplicates100 xpTreating duplicates100 xp
Text and categorical data problems
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.
Advanced data problems
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.
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.Comparing strings50 xpMinimum edit distance50 xpThe cutoff point100 xpRemapping categories II100 xpGenerating pairs50 xpTo link or not to link?100 xpPairs of restaurants100 xpSimilar restaurants100 xpLinking DataFrames50 xpGetting the right index50 xpLinking them together!100 xpCongratulations!50 xp
DatasetsRide sharing datasetAirlines datasetBanking datasetRestaurants datasetRestaurants dataset II
Content Developer @ DataCamp
Adel is a Data Science educator, speaker, and Evangelist at DataCamp where he has released various courses and live training on data analysis, machine learning, and data engineering. He is passionate about spreading data skills and data literacy throughout organizations and the intersection of technology and society. He has an MSc in Data Science and Business Analytics. In his free time, you can find him hanging out with his cat Louis.