Data visualization is a critical part of any data science project. Once data have been imported and wrangled into place, visualizing your data can help you get a handle on what’s going on in the data set. Similarly, once you’ve completed your analysis and are ready to present your findings, data visualizations are a highly effective way to communicate your results to others. In this course we will cover what data visualization is and define some of the basic types of data visualizations.
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Spécialisation Tidyverse Skills for Data Science in RUniversité Johns-HopkinsÀ propos de ce cours
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Dates limites flexibles
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Certificat partageable
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100 % en ligne
Commencez dès maintenant et apprenez aux horaires qui vous conviennent.
Cours 4 sur 5 dans le
Approx. 17Â heures pour terminer
Anglais
Sous-titres : Anglais
Ce que vous allez apprendre
D​istinguish between various types of plots and their uses
U​se the ggplot2 R package to develop data visualizations
B​uild effective data summary tables
B​uild data animations for visual storytelling
Dates limites flexibles
Réinitialisez les dates limites selon votre disponibilité.
Certificat partageable
Obtenez un Certificat lorsque vous terminez
100 % en ligne
Commencez dès maintenant et apprenez aux horaires qui vous conviennent.
Cours 4 sur 5 dans le
Approx. 17Â heures pour terminer
Anglais
Sous-titres : Anglais
Offert par
Université Johns-Hopkins
The mission of The Johns Hopkins University is to educate its students and cultivate their capacity for life-long learning, to foster independent and original research, and to bring the benefits of discovery to the world.
Programme de cours : ce que vous apprendrez dans ce cours
22Â minutes pour terminer
About This Course
Data visualization is a critical part of any data science project. Once data have been imported and wrangled into place, visualizing your data can help you get a handle on what’s going on in the dataset. Similarly, once you’ve completed your analysis and are ready to present your findings, data visualizations are a highly effective way to communicate your results to others.
22Â minutes pour terminer
3 lectures
1Â heure pour terminer
Plot Types
There are many types of plots that are helpful. We’ll discuss a few basic ones below and will include links to a few galleries where you can get a sense of the many different types of plots out there.
1Â heure pour terminer
7 lectures
1Â heure pour terminer
Making Good Plots
The goal of data visualization in data analysis is to improve understanding of the data. As mentioned in the last lesson, this could mean improving our own understanding of the data or using visualization to improve someone else’s understanding of the data. We discussed some general characteristics and basic types of plots in the last lesson, but here we will step through a number of general tips for making good plots. When generating exploratory or explanatory plots, you’ll want to ensure information being displayed is being done so accurately and in a away that best reflects the reality within the dataset. Here, we provide a number of tips to keep in mind when generating plots.
1Â heure pour terminer
8 lectures
5Â minutes pour terminer
Plot Generation Process
Having discussed some general guidelines, there are a number of questions you should ask yourself before making a plot. There are three main questions you should ask any time you create a visual display of your data. We will discuss these three questions below.
5Â minutes pour terminer
1 lecture
2Â heures pour terminer
ggplot2 Basics
R was initially developed for statisticians, who often are interested in generating plots or figures to visualize their data. As such, a few basic plotting features were built in when R was first developed. These are all still available; however, over time, a new approach to graphing in R was developed. This new approach implemented what is known as the grammar of graphics, which allows you to develop elegant graphs flexibly in R. Making plots with this set of rules requires the R package ggplot2. This package is a core package in the tidyverse, so as along as the tidyverse has been loaded in, you’re ready to get started.
2Â heures pour terminer
7 lectures
3Â heures pour terminer
ggplot2: Customization
So far, we have walked through the steps of generating a number of different graphs (using different geoms) in ggplot2. We discussed the basics of mapping variables to your graph to customize its appearance or aesthetic (using size, shape, and color within aes()). Here, we’ll build on what we’ve previously learned to really get down to how to customize your plots so that they’re as clear as possible for communicating your results to others. The skills learned in this lesson will help take you from generating exploratory plots that help you better understand your data to explanatory plots – plots that help you communicate your results to others. We’ll cover how to customize the colors, labels, legends, and text used on your graph. Since we’re already familiar with it, we’ll continue to use the diamonds dataset that we’ve been using to learn about ggplot2.
3Â heures pour terminer
9 lectures
1Â heure pour terminer
Tables
While we have focused on figures here so far, tables can be incredibly informative at a glance too. If you are looking to display summary numbers, a table can also visually display information.
1Â heure pour terminer
6 lectures
3Â heures pour terminer
ggplot2: Extensions
Beyond the many capabilities of ggplot2, there are a few additional packages that build on top of ggplot2’s capabilities. We’ll introduce a few packages here so that you can (1) directly annotate points on plots (ggrepel and directlabels); (2) combine multiple plots (cowplot + patchwork); and (3) generate animated plots (gganimate). These are referred to as ggplot2 extensions There are dozens of additional ggplot2 extensions available if you’d like to explore other plotting options beyond what is covered here!
3Â heures pour terminer
5 lectures
3Â heures pour terminer
Case Studies
At this point, we’ve done a lot of work with our case studies. We’ve introduced the case studies, read them into R, and have wrangled the data into a usable format. Now, we get to peek at the data using visualizations to better understand each dataset’s observations and variables! When working through the steps of the case studies, you can use either RStudio on your own computer or Coursera lab spaces provided for each case study.
3Â heures pour terminer
8 lectures
2Â heures pour terminer
Project: Visualizing Data in the Tidyverse
In this project, you will practice exploring data and creating data visualizations with the tidyverse using nutrition and sales data from fast food restaurants in 2018.
2Â heures pour terminer
À propos du Spécialisation Tidyverse Skills for Data Science in R
This Specialization is intended for data scientists with some familiarity with the R programming language who are seeking to do data science using the Tidyverse family of packages. Through 5 courses, you will cover importing, wrangling, visualizing, and modeling data using the powerful Tidyverse framework. The Tidyverse packages provide a simple but powerful approach to data science which scales from the most basic analyses to massive data deployments. This course covers the entire life cycle of a data science project and presents specific tidy tools for each stage.
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