25 de dez de 2018
Very Very Rigorous Course for a beginner on R language and because of its nature, after completing just one course, I feel like I have gained a lot of knowledge and also familiarity with R language.
17 de jun de 2019
A very good course to read and get the valuable content of R language. This is for the students who want to learn and practice the basic and some intermediate concepts of data manipulation.
por Paul D•
10 de abr de 2018
This course should be removed for two reasons:
1. The only videos are the introduction videos. Everything else is a text-based assignment. This is just lazy. If I wanted to google how commands worked, I can do that without paying for Coursera. There is no instructional material contained in this course.
2. The student is required to submit assignments through a third-party interface that doesn't work. Completed assignments are not given credit. There are many people in the discussion forums saying the same thing.
por The B M H•
17 de jun de 2019
This course uses a software package developed by the instructors for a portion of the required tests. There are serious bugs in this package that make it impossible for students to complete the tasks assigned. Going through the discussion boards, these flaws have been present for at least 2 years -- clearly Johns Hopkins in general, and the instructors in particular, hold the students' time and learning experience in such low regard it borders on contempt.
por David M•
25 de mar de 2019
The content is good, but many students (including me) are NOT able to submit assignments with the course "token". I've commented in the course discussion forum about this, and I have opened a support ticket with Coursera, but no one is taking serious initiative to correct the malfunction.
por Maurizio C•
12 de out de 2017
Great gap between teaching and what is required to pass the course. Unnecessarily difficult.
The didactic material is not compelling.
por Mathieu G•
19 de nov de 2017
Not possible to submit programming assignments, this course seems to have a lot of technical issues. Signing out during the first week and un-enrolling the specialization. I'll check again later to see if those technical problems are solved.
por Deleted A•
16 de abr de 2017
This course, and the Specialization as a whole, is poorly structured and a rather cursory overview that is unlikely to satisfy serious learners. If the material is completely new to you then it will likely leave you confused as it does not adequately explain the concepts. If you are already somewhat familiar and are looking for deeper dive into R and programming you will be disappointed as the courses just don't have the depth of material needed to gain mastery over the subject.
Your money and time would probably be better spent on a couple of books by Wickham.
por Anne N N T A•
26 de ago de 2019
The course dumps a ginormous amount of content onto learners while being extremely poorly structured. The course materials are littered with spelling and formatting errors. There are assignment segments in the course that require R functions that were not covered in the syllabus. Multiple datasets required for stepping through the course materials as well as required assignments were at best not provided by mistake or neglect (datasets.zip file only contains the "Team Standings" data), or at worst provided only with the purchase of the textbook + dataset on top of the Coursera subscription fee. Some of these issues could potentially have been solved by having more responsive instructors in the forum, but they were nowhere to be seen, and there are questions with datasets or swirl token that date back years without replies. Overall, I highly recommend spending your money somewhere else. Perhaps downloading swirl alone with all its free materials without going through this course is a good start.
por Ashrith R•
1 de fev de 2018
Swirl doesn't allow some codes even if its correct. '=' is not allowed for example.
por Rokas K•
7 de ago de 2019
When a number of students ran into an identical problem with an assignment, there were no support or help, for weeks. By the end, we never got any support. A work-around the glitch was found by a student. For a paid course that is not optimal.
por Andrew F•
26 de jun de 2017
this course basically just has you run through the widely available SWIRL packages and then gives you a quiz it has poorly prepared you for and charges you for the privilege.
por Álvaro M C•
3 de abr de 2020
Completely disappointing. Much of the practice is performed in R using a package named swirl(), ehich produces an incredible amount of errors in a lot of silly aspects such as only checking if the code you wrote is exactly the same that it has stored as solution, rather than checking if the solution is the same.
The assignments are also awful, the test questions are poprly written, the R dataframes have errors in the name of the variables, the forum is outdated (since the last comments observed correspod to 2016)
Im canceling my subscription to this course right now.
por Damian S•
8 de mai de 2018
If I wanted to read a book, I would have bought the book.
There are also many "right" ways to code, and the swirl tutorial, while helpful for learning specific syntax, should not grade correct answers as wrong simply because they use a different syntax. It is overly rigid.
por Shane A•
25 de dez de 2017
Not at all engaging. Its like a university lecturers notes without any personal interaction or videos.
por Anseh D•
27 de jun de 2019
There was no mentor to help.
por Ned B•
18 de fev de 2018
I really enjoyed this course. I thought it was a really good introduction to R. I thought Swirl was a really good tool as well. The Week 02 Swirl assignment was more time consuming than the others and the Week 04 quiz which required hands on problem solving was very good and an excellent review of the materials. I would emphasize to future students to review the online textbook and to be prepared for Google Searching in order to answer some of the questions especially from Week 02 - 04. In other words, not everything one needs to pass this course is solely contained within the weekly chapters nor the suggested textbook. I assume however; that this is by design to stretch the student and to force them to put time into learning and understanding the materials and searching the Internet for additional help. Bravo!
por Shawn M•
17 de jan de 2019
Loved this course! Beware that the material is at an intermediate level, and not really appropriate for beginner R programmers. The final quiz was extremely challenging, as it should be, and very useful.
I give this course six stars and take one away for the automated upload of answers from R (the swirl package). This package /process is really buggy and causes needless grief especially in Lesson 2.
The content of this course is A+++
por Lance D•
3 de nov de 2018
Excellent tour of basic R programming with many examples and well thought out assignments . The final project uses a real life data set and it was fun to use dplyr piping to find the correct answers. The Swirl program, which is downloaded inside of R as a package and is used for grading, was a little cumbersome at first, but once you get the hang of it, then it's not bad. Hang in there and don't give up.
por Diogo A•
26 de dez de 2016
This is a really great introductory course to R as a programming language. By the end of it, you do become proficient in reading data from different formats into R and in performing basic data manipulation routines using cutting edge packages. Fantastic if you are a beginner. If you are already fairly experienced in R, only the last week of the course may hold some interest to you.
por Ilian A•
5 de fev de 2017
This course was a very good and powerful intro in data wrangling and tidy data. The base of the course is the interactive swirl environment which lets you experiment and play around while guiding and teaching you. The exercises in the end of the course can be a challenge and force you to combine and use all the knowledge presented throughout the course.
por Fergus I•
2 de mar de 2017
Amazing course, I would say addictive. However the swirl lesson #12 on Data Manipulation and quiz of week #4 on Reading and Summarizing Data offer a huge difficulty spike in comparison with the rest of the assignments. I would say almost too high compared to the rest, I would rather increase the difficulty gradually.
por Adriana B D P•
11 de fev de 2018
It was an excellent course. Even as an R user I learned a few things. Swirl can be annoying sometimes since even if you get the same answer using a different function it counts as wrong. The quiz had some tricks that one had to be aware of but they're not discussed in the course, I looked in the Forums.
por William L K•
7 de jul de 2017
Excellent course. Very well organized with plenty of course material to access for help. One thing though, given how good a lecturer Roger Peng is, it would be nice to have a few lectures interspersed throughout the course. Not needed but it would break up the lessons a bit.
por Yang Z•
26 de jan de 2019
Very practical course with plenty of practices to get you started data handling in R. Course focus on Tidyverse series of packages which come in handy when dealt with data manipulation. Little is talked about on in-built functions of R and use of functions is not covered.
por Patrycja D•
28 de fev de 2020
Assignments have some errors, that have been reported years ago to the course mentors, but haven't been fixed.
por Geoffrey S R•
5 de out de 2021
Needs more discussion and extensive practice problems.