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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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1051 - 1075 of 1,296 Reviews for Getting and Cleaning Data

By Fabio P

Oct 14, 2017

A good course

By Sabawoon S

Jun 28, 2017

Very helpful.

By Venkata N K T

May 10, 2016

Very valuable

By Ted S

Jan 31, 2016

Great course.

By Harsha G

Mar 3, 2016

very helpful

By Giorgos A

May 26, 2019

good course

By M C

Jan 22, 2021

Pretty OK

By Greg B G

Oct 3, 2016

very good

By Khobindra N C

May 18, 2016


By Luiz C

Sep 16, 2017


By Nithya M

Jun 23, 2017


By Shreya S

Mar 20, 2017


By Veena M

Feb 21, 2016


By Chuang M

Feb 6, 2016


By Marcos A

May 12, 2019


By Nithin k G

Nov 16, 2018


By Ashish S

Feb 6, 2017


By shipra g

Aug 8, 2016


By Vivek R

Feb 7, 2016


By Mrunal 1

May 8, 2021


By Dimitri d

Feb 23, 2017


By Sergio E R G

Nov 27, 2016


By sugyoo

Oct 22, 2016


By Borja C

May 7, 2016


By Miguel C

Mar 25, 2020

I really enjoyed and learned a lot in this course.

I feel a lot more comfortable with looking for and reading data. I learned how to clean data and getting it ready for further analysis. I think the course project was particularly good for completely understanding the process of tidying data and all the aspects it involves, such as writing a code book and a README file for accompanying it.

Furthermore, I believe I further developed my R programming skills, by learning how to code new things or things I already knew but in a more efficient way, by using new packages and techniques.

Moreover, I found Professor Jeffrey Leek quite engaging, very easy to understand and I had complete confidence in his knowledge on this subject.

However, I believe the course is slightly outdated. I was often disheartened and frustrated by not being able to replicate what was being done in the lecture videos. For example, there were many links that did not work anymore and sometimes information that simply wasn't correct anymore. I found the discussion forums and many mentors responses to be very helpful. I think this can easily be fixed by writing up an errata or updating the lecture videos.