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Avis et commentaires pour d'étudiants pour Obtenir et trier des données par Université Johns-Hopkins

7,923 évaluations
1,310 avis

À propos du cours

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....

Meilleurs avis


2 mai 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.


1 févr. 2016

Easy, mostly instructive Course. The Assignments and quizzes are quite good, and illustrates the lessons very well.\n\nSee the videos for general presentation, but use the energy on the excersizes.

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1151 - 1175 sur 1,273 Avis pour Obtenir et trier des données

par Jack H

1 juin 2020

Not as good as the other courses offered by this specialisation. In need of an update!!

par Himanshu R

26 oct. 2017

Need more lectures on R packages and newly added packages like reshape, dplyr etc.

par Juan A S O

25 avr. 2016

The evaluation part of the course needs some fixing. Otherwise, very good course!

par Samidha S

2 sept. 2017

Course touches points very superficially. Need to have better reference material.

par Edward A S M

3 nov. 2019

More examples of code running in parallel with the course work will be helpful.

par Derek R

15 déc. 2017

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

par Ish G

5 mars 2016

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

par 엄태인

26 juil. 2021

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

par Jean-Francois J

5 févr. 2017

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

par Doug E

27 juil. 2016

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

par Fabien N

8 nov. 2019

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

par finbar k

26 juin 2018

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

par Jatin N S

28 mars 2022

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

par Lee C W

27 mai 2018

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

par Denis S C

1 nov. 2017

Explanation could be more elaborated like the earlier courses

par JP B

6 août 2016

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

par Andrew T

1 févr. 2018


Too much talking. Not enough integrated exercises.

par Ryan W

24 oct. 2018

Mostly just R programming with data science in passing.

par Thomas G

19 août 2016

Very usefull but can be technical and discouraging


30 mai 2017

needs little more real time scenario examples..

par Pedro V Q d C

9 nov. 2016

Course is too simple, should be more extensive.

par Madhubalini V

6 oct. 2020

practices is much needed to complete projects.

par Dr. M H A J

2 juil. 2018

Amazing, Kindly update the versions always.

par Ahmed A

14 juin 2020


par Ivo G G V

20 juin 2019

It needs an update on some libraries.