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You're reading from  The Statistics and Machine Learning with R Workshop

Product typeBook
Published inOct 2023
Reading LevelIntermediate
PublisherPackt
ISBN-139781803240305
Edition1st Edition
Languages
R
Concepts
Machine Learning
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Author (1)
Liu Peng
Liu Peng
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Liu Peng

Peng Liu is an Assistant Professor of Quantitative Finance (Practice) at Singapore Management University and an adjunct researcher at the National University of Singapore. He holds a Ph.D. in statistics from the National University of Singapore and has ten years of working experience as a data scientist across the banking, technology, and hospitality industries.
Read more about Liu Peng

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Data merging with dplyr

In practical data analysis, the information we need is not necessarily confined to one table but is spread across multiple tables. Storing data in separate tables is memory-efficient but not analysis-friendly. Data merging is the process of merging different datasets into one table to facilitate data analysis. When joining two tables, there need to be one or more columns, or keys, that exist in both tables and serve as the common ground for joining.

This section will cover different ways to join tables and analyze them in combination, including inner join, left join, right join, and full join. The following list shows the verbs and their definitions for these four types of joining:

  • inner_join(): Returns common observations in both tables according to the matching key.
  • left_join(): Returns all observations from the left table and matched observations from the right table. Note that in the case of a duplicate key value in the right table, an additional...
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The Statistics and Machine Learning with R Workshop
Published in: Oct 2023Publisher: PacktISBN-13: 9781803240305
© 2023 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Liu Peng

Peng Liu is an Assistant Professor of Quantitative Finance (Practice) at Singapore Management University and an adjunct researcher at the National University of Singapore. He holds a Ph.D. in statistics from the National University of Singapore and has ten years of working experience as a data scientist across the banking, technology, and hospitality industries.
Read more about Liu Peng

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