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Data Wrangling with R

Data Wrangling with R

By : Gustavo R Santos, Gustavo Santos
4.9 (7)
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Data Wrangling with R

Data Wrangling with R

4.9 (7)
By: Gustavo R Santos, Gustavo Santos

Overview of this book

In this information era, where large volumes of data are being generated every day, companies want to get a better grip on it to perform more efficiently than before. This is where skillful data analysts and data scientists come into play, wrangling and exploring data to generate valuable business insights. In order to do that, you’ll need plenty of tools that enable you to extract the most useful knowledge from data. Data Wrangling with R will help you to gain a deep understanding of ways to wrangle and prepare datasets for exploration, analysis, and modeling. This data book enables you to get your data ready for more optimized analyses, develop your first data model, and perform effective data visualization. The book begins by teaching you how to load and explore datasets. Then, you’ll get to grips with the modern concepts and tools of data wrangling. As data wrangling and visualization are intrinsically connected, you’ll go over best practices to plot data and extract insights from it. The chapters are designed in a way to help you learn all about modeling, as you will go through the construction of a data science project from end to end, and become familiar with the built-in RStudio, including an application built with Shiny dashboards. By the end of this book, you’ll have learned how to create your first data model and build an application with Shiny in R.
Table of Contents (21 chapters)
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1
Part 1: Load and Explore Data
5
Part 2: Data Wrangling
12
Part 3: Data Visualization
16
Part 4: Modeling

Introduction to date and time

In R, there are three objects related to date and time: date, time, and datetime. The definition is as logical as it looks:

  • date: Object refers to a date YYYY-MM-DD
  • time: Object stores time data, as HH: MM: SS
  • datetime: A combination of both YYYY-MM-DD HH: MM: SS

From now on, I will mostly refer to datetime objects, as these are a combination of both other types and are the most common as well.

It is important to note that computers calculate time based on January 1, 1970, at 00:00:00 UTC. As a side note, UTC means Universal Time Coordinated, formerly known as Greenwich Mean Time (GMT), which is the point that regulates the world time zones. Every calculation of time zone is done from that point, adding or subtracting hours.

In the late 1960s and early 1970s, Unix engineers had to pick a date to use as ground zero when the clock started to count for computers. For the sake of calculation easiness, January 1 was convenient...

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