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Learner Reviews & Feedback for Getting and Cleaning Data by Johns Hopkins University

8,004 ratings

About the Course

Before you can work with data you have to get some. This course will cover the basic ways that data can be obtained. The course will cover obtaining data from the web, from APIs, from databases and from colleagues in various formats. It will also cover the basics of data cleaning and how to make data “tidy”. Tidy data dramatically speed downstream data analysis tasks. The course will also cover the components of a complete data set including raw data, processing instructions, codebooks, and processed data. The course will cover the basics needed for collecting, cleaning, and sharing data....

Top reviews


May 2, 2020

This course provides an introduction of some important concepts and tools on a very important aspect of data science: cleaning and organizing data before any analysis. A must for any data scientist.


Feb 1, 2016

Easy, mostly instructive Course. The Assignments and quizzes are quite good, and illustrates the lessons very well.

See the videos for general presentation, but use the energy on the excersizes.

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1176 - 1200 of 1,296 Reviews for Getting and Cleaning Data

By Derek R

Dec 15, 2017

This course really gets you working with R. The swirl exercises are great.


Mar 5, 2016

very nicely made course providing a good hands on with R language. Thanks!

By 엄태인

Jul 26, 2021

The letrue should be updated. Most of the URL address is not accessible

By Jean-Francois J

Feb 5, 2017

The course isn't that hard but there is a lot of content to assimilate.

By Gianni K B

Jan 29, 2023

Information used in the lesson are outdated, so it is quite useless.

By Doug E

Jul 27, 2016

Topics were OK but the focus on R and no other tools is frustrating

By Fabien N

Nov 8, 2019

The course was good but a bit too versatile for such hard quizzes.

By finbar k

Jun 26, 2018

Vague instructions in many of the quizes and the final assignment.

By Jatin N S

Mar 28, 2022

It would be better if for each function there were more examples.

By Lee C W

May 27, 2018

Average. Not useful even to tackle its own quizes and assignment.

By Denis S C

Nov 1, 2017

Explanation could be more elaborated like the earlier courses


Aug 6, 2016

Not well explained.... Previous module was better structured.

By Andrew T

Feb 1, 2018


Too much talking. Not enough integrated exercises.

By Ryan W

Oct 24, 2018

Mostly just R programming with data science in passing.

By Thomas G

Aug 19, 2016

Very usefull but can be technical and discouraging


May 30, 2017

needs little more real time scenario examples..

By Pedro V Q d C

Nov 9, 2016

Course is too simple, should be more extensive.

By Supun A

Sep 1, 2022

peer review assignment is not getting reviewed

By Madhubalini V

Oct 6, 2020

practices is much needed to complete projects.

By Dr. M H A J

Jul 2, 2018

Amazing, Kindly update the versions always.

By Ahmed A

Jun 14, 2020


By Ivo G G V

Jun 20, 2019

It needs an update on some libraries.

By Mario P

Dec 9, 2017

Useful, but a little boring.


Jul 22, 2017

its so hard for beginner to

By Antoine D

Sep 3, 2016

Interesting but too simple.