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Learning data.table eBook (PDF)
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Chapters
Chapter 1: Getting started with data.table
Chapter 2: Adding and modifying columns
Chapter 3: Cleaning data
Chapter 4: Computing summary statistics
Chapter 5: Creating a data.table
Chapter 6: Joins and merges
Chapter 7: Reshaping, stacking and splitting
Chapter 8: Subsetting rows by group
Chapter 9: Using .SD and .SDcols for the subset of data
Chapter 10: Using keys and indices
Chapter 11: Using list columns to store data
Chapter 12: Why is my old code not working?