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Вернуться к Сбор и сортировка данных

Отзывы учащихся о курсе Сбор и сортировка данных от партнера Университет Джонса Хопкинса

Оценки: 7,938
Рецензии: 1,314

О курсе

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....

Лучшие рецензии


2 мая 2020 г.

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.


25 окт. 2016 г.

This course is really a challenging and compulsory for any one who wants to be a data scientist or working in any sort of data. It teaches you how to make very palatable data-set fro ma messy data.

Фильтр по:

1226–1250 из 1,277 отзывов о курсе Сбор и сортировка данных

автор: DESIREE P

10 мар. 2021 г.

Messier than the 2 previous courses. Lacks explanations for codebook in the peer-graded exam.

автор: Sudarshan P

5 дек. 2017 г.

The course material needs update. There are code snippets that do not work.

автор: Aditya D

18 сент. 2017 г.

This course could have been better. It was all textual and it got boring.

автор: James C

29 мая 2017 г.

Final assignment is not well detailed, and may cause confusion.

автор: Guy P

3 мар. 2016 г.

This course lacks projects to implement the skills we learn.

автор: Lee D

18 мая 2016 г.

The course was a bit mixed in terms of its quality.

автор: Colin H

21 окт. 2020 г.

Guidance for assessments could be a lot better

автор: Adam K

25 авг. 2019 г.

Very poor instructions for assignments.

автор: Rafee S

25 февр. 2019 г.

waste of time for software engineers

автор: Maximilian P

11 июля 2018 г.

Too many things in one place

автор: Sergio B S

17 нояб. 2017 г.

Worst class in this series.

автор: Michal K

29 апр. 2016 г.

too superficial

автор: Leandro J G D

12 мая 2020 г.

Lacking focus.

автор: Warren

5 авг. 2016 г.


автор: Walson Q

29 нояб. 2018 г.


автор: Dan H

16 янв. 2018 г.

This course is about getting data from the web and processing it using a computer language and packages in that language that are under active development. There is a github repo with course content and other electronic resources that are made to be easy to update. It has never been updated, even once since the course first went live 4 years ago. There are many broken links, several new features and bugs in packages that make lecture content obsolete or broken, errors found by students, etc. None of these issues have been addressed, even once, in any of the material, including the extremely easy to update content on github. This is disappointing and not very professional. Additionally, many of the notes are not particularly good to begin with. Much of it is essentially cribbed from other online tutorials, examples in the documentation, and in a few cases, someone else's (also broken) lectures. Take this course if you want a study group (the forums are actually quite useful) to help you go through 4 year old lectures rehashing online tutorials from 4 years ago about a topic that changes pretty quickly.

автор: Grant I

22 янв. 2018 г.

Made it all the way to week four and decided to drop this entire specialization. The data set in the final project is poorly referenced (despite the code book provided). The data set comes in 24 text files you have to merge (which isn't a problem in R) but what is a problem is when you don't understand what the variables and observations are. Perhaps if I worked in the medical field these measurements would mean more, but to a business major, they are incomprehensible with the limited documentation provided. So my assumption was, if I am having difficulty understanding what the final data structure should look like, others will be having the same problem......and its peer reviewed. How can I possible grade someone else

автор: Abdulaziz M A A

2 июля 2020 г.

I have to date completed the first 2 courses in Data Science: Foundations using R Specialization.

Today I have cancelled my subscription for the following reasons:

1 Poor course design and delivery

Lesson contents inadequately covered and sourced, lecturers deliver a fast paced recordings with very little examples and references making it hard for beginner students to keep pace and find themselves unprepared for the required quizzes and exams.

2 Course materials needs to be updated and presented to facilitate learning , eg. often times students are referred to static links and too many many times new and un-familiar concepts/ functions are rushed thru with no introduction or explanation.

автор: Ryan N

29 окт. 2021 г.

C​ourse content is ok except for the week 2, quite confusing. Not very detail. Quite a few slides asking you to read up yourself from other sources.

A​nd for the quizzes, mostly beyond the scope of the course.

P​roject wise, coding part is fine. The part that is totally not fine is the project requires you to prepare codebook and README, without any guidance in any videos in this course, or courses prior to taking this course. All you need is to read up yourself from other sources. The community are assuming people who are taking these courses have good knowledge in programming related work.

автор: Apurva G

30 мар. 2020 г.

Its extremely difficult to install the packages. Most of the time the instructions are not clear on what packages to intall in the videos. There should be a pre-read with links and instructions on which packages are needed to be able to work on this course. Extremely frustrating, considering a majority of the time is wasted just trying to figure out how to install packages. If you are serious about success of course takers, you have to make it easier to understand and instructions have to be clear.

автор: Andrés P

22 июня 2022 г.

I received my certificate and it states the following:

"This certificate does not af_rm that this learner was enrolled as a student at Johns Hopkins University. It does not confer a JHU grade, course credit or degree; establish a relationship between this learner and JHU; enroll or register this learner at JHU or in any course offered by JHU; or entitle this learner to access or use resources beyond the online courses provided by Coursera."

Does this mean has no validation?

автор: Deleted A

13 янв. 2017 г.

For such a terrible course to then change payment terms without my authorisation. Take $64 from my account without telling me clearly amongst all the other junk mail. Coursera have a lot to answer for, and this specialisation is not even worth wasting your time if it was free.

Taught without purpose; meaningless instructions given to copy without regard of the bigger picture.

автор: Quoc N

18 февр. 2018 г.

First quiz states 10 minutes for a 5 question quiz. I am taking way longer due to errors in loading packages and Java. One of the question is out of date and has not been updated in a year. Quality of this course is lacking when changes are constant. The mentors say it's realistic. I'd considering dropping this course and search for a better updated one.

автор: Daniel L

7 февр. 2021 г.

Packages and code shown is outdated, different file formats are shown very briefly, without any attempt to communicate understanding. If I have to reproduce code that does not work and then spend hours googling solutions to problems I would not have if this course was done properly, I prefer not doing the course at all. Waste of time.

автор: Pooia L

19 авг. 2018 г.

This was a mix of everything course, nothing was completely explained. It would have been a better idea to just pick a limited options and cover them well. The description of the final project was a puzzle and the objective behind it was completely vague. I wanted to quit in the middle, but I put time and that is why I finished it!!!