by | Released February 2015 | ISBN: 9781491917046

Analysts often spend 50-80% of their time preparing and transforming data sets before they begin more formal analysis work. This video tutorial shows you how to streamline your code—and your thinking—by introducing a set of principles and R packages that make this work much faster and easier. Garrett Grolemund, Data Scientist and Master Instructor at RStudio, demonstrates how R and its packages help you tackle three main issues:Data Manipulation. Data sets contain more information than they display. By transforming your data, you can reveal a wealth of descriptive statistics, group level observations, and hidden variables. R's dplyr package provides optimized functions to help you transform data, as well as a pipe syntax that makes R code more concise and intuitive.Data Tidying. Data sets come in many formats, but R prefers just one. R runs quickly and intuitively when your data is stored in the tidy format, a layout that allows vectorized programming. R's tidyr package reshapes the layout of your data sets, making them tidy while preserving the relationships they contain.Data Visualization. The structure of data visualizations parallels the structure of data sets. Once your data is tidy, visualizations become straightforward: each observation in your dataset becomes a mark on a graph, each variable becomes a visual property of the marks. The result is a grammar of graphics that lets you create thousands of graphs. R's ggvis package implements the grammar, providing a system of data visualization for R.Garrett Grolemund is a Data Scientist and Master Instructor at RStudio. Garrett maintains the lubridate R package and is the author of Hands-On Programming with R and the upcoming Data Science with R (both O'Reilly books). Show and hide more Publisher resources View/Submit Errata

1. Introduction
   • Introduction 00:06:31
   • Two New Conventions 00:08:18
   • Data Science for Data Wranglers 00:14:20
2. Data Manipulation
   • The dplyr Package 00:02:24
   • Select Variables 00:08:29
   • Filter Observations 00:10:03
   • Derive Variables 00:06:03
   • Summarize Observations 00:08:41
   • Group Observations 00:17:37
   • Re-Arrange Observations 00:05:08
   • Case Study 1 - TB Counts 00:08:27
   • Data Science for Data Wranglers, Part 2 - Units of Analysis 00:14:32
3. Data Tidying
   • Data Science for Data Wranglers, Part 3 - Tidy Data 00:10:46
   • Reshape the Layout of Your Data 00:18:14
   • Separate and Unite Variables 00:06:51
   • Data Science for Data Wranglers, Part 4 - The Best Format 00:17:43
   • Combine Data Sets 00:16:33
   • Case Study 2 - TB Rates 00:09:08
4. Data Visualization
   • Data Science for Data Wranglers, Part 5: The Structure of Visualizations 00:05:53
   • Visualize Observations 00:08:29
   • Visualize Variables 00:17:04
5. Conclusion
   • How to Learn More 00:09:35
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