课程

Intermediate Importing Data in R

中级技能水平

更新时间 2024年9月

Parse data in any format. Whether it's flat files, statistical software, databases, or data right from the web.

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RData Preparation

3小时

10 视频

48 道练习

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课程描述

In this course, you will take a deeper dive into the wide range of data formats out there. More specifically, you'll learn how to import data from relational databases and how to import and work with data coming from the web. Finally, you'll get hands-on experience with importing data from statistical software packages such as SAS, STATA, and SPSS.

先决条件

Introduction to Importing Data in R

1

Importing data from databases (Part 1)

Many companies store their information in relational databases. The R community has also developed R packages to get data from these architectures. You'll learn how to connect to a database and how to retrieve data from it.

Connect to a database

Establish a connection

Inspect the connection

Import table data

List the database tables

Import users

Import all tables

How do the tables relate?

2

Importing data from databases (Part 2)

Importing an entire table from a database while you might only need a tiny bit of information seems like a lot of unncessary work. In this chapter, you'll learn about SQL queries, which will help you make things more efficient by performing some computations on the database side.

SQL Queries from inside R

Query tweater (1)

Query tweater (2)

Query tweater (3)

Query tweater (4)

Join the query madness!

DBI internals

Send - Fetch - Clear

Be polite and ...

3

Importing data from the web (Part 1)

More and more of the information that data scientists are using resides on the web. Importing this data into R requires an understanding of the protocols used on the web. In this chapter, you'll get a crash course in HTTP and learn to perform your own HTTP requests from inside R.

HTTP

Import flat files from the web

Secure importing

Downloading files

Import Excel files from the web

Downloading any file, secure or not

Reading a text file from the web

HTTP? httr! (1)

HTTP? httr! (2)

4

Importing data from the web (Part 2)

Importing data from the web is one thing; actually being able to extract useful information is another. Learn more about the JSON format to get one step closer to web domination.

APIs & JSON

From JSON to R

Import JSON data from API

JSON & jsonlite

JSON practice (1)

JSON practice (2)

Minify and prettify

5

Importing data from statistical software packages

Next to R, there are also other commonly used statistical software packages: SAS, STATA and SPSS. Each of them has their own file format. Learn how to use the haven and foreign packages to get them into R with remarkable ease!

Import SAS data with haven

Import STATA data with haven

What does the graphic tell?

Import SPSS data with haven

Factorize, round two

Import STATA data with foreign (1)

Import STATA data with foreign (2)

Do you know your data?

Import SPSS data with foreign (1)

Excursion: Correlation

Import SPSS data with foreign (2)

Intermediate Importing Data in R

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