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.
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.
von Gabriel T d O•
Great course. Could be more interactive and could have more detailed instructions for the Course Project. Last task for the Course Project uses a function that is not covered in previous lessons, which I think is not OK.
von pascal b•
I really started to get interested in R only when I started this course.
Before that, it was just an old, cryptic language that could not do more than what I can do with Excel.
Now I am starting to see the full potential
von Luis G N C•
It is a good course. I believe that the final project is challenging but quite extensive and requires dedication to solve it. I would have liked for this course, to establish a formal methodology for data cleansing.
von Lorenzo R•
Some files that were used for the examples were no longer accessible. Updates to the xlsx package also were not reflected or discussed. As I noticed on the forums several students had issues with java dependencies.
von Timofan M•
The 3rd course in the specialization was great in terms of the materials presented.
But the "homework" requirements were a little bit unclear most of the times, even though the actual solution was fairly simple.
von Valerie H•
Capstone project is a little ambiguous. Although that's good experience having to find a way to reason out what the objective is based on limited information.
Introduction to chained dplyr is incredibly useful.
von Jesus M S•
Clearly structured course, but as with previous courses of the Data Science program, there is a gap regarding coding skills which the course does not till for those of us lacking a programming background.
von Juan P L R•
Most of the course was interesting, well-designed and useful. Some lectures and links have to be upgraded. This is a really good course if you want to know what possibilities you have to get data with R.
von Sean F•
Good course, instructors are very knowledgeable. Would be good to add more practical lessons and extend the course. As they say, repetition is the law of learning. Thank you for helping me get this far!
von Tony W•
The assignment was excellent but challenging, instruction wasn't too clear or obvious though, struggled for a while (good kind of struggle)
The lecture was okay but the Swirl part is always fantastic.
von Carlos G W•
I think that the level of difficulty of the exercises and final assignment does not match with the depth of the lectures; without a textbook, I feel lost, don't have a reference, and have to guess.
von NEVIN T K•
The 'cleaning data' part was explained pretty well... I do feel he could've gone into more detail for the 'gathering data' part- especially the webscraping part. Other than that, great course!
von aparna T•
Very interesting and enjoyed doing the Assignment.
but the assignment instructions are not clear.A lot of time was wasted trying to figure out what data is what are what are we interested in.
von Ash G•
The course was very helpful & guided but since I don't have a strong coding background I felt myself getting lost often. It would be really helpful if there is some guidance in assignments.
von Joonas S•
The course material is ok - it would really need a book like the other courses have. It is much easier to check something from a book than slides/video when doing the assignments etc. .
The Swirl practice part is great! But there is a big gap between what we learned from video/swirl and the course project! The project is much harder than what I learn from the course.
von Robert D•
Good coverage of topics. A bit scattered in early slides and assignments were often inconsistent with coursework. Overall a great introduction of what to expect when gathering data.
von Ramon R•
I found the last project insufficiently explained. I was struggling in understanding what the task is. A bit more clear task description (as in Course 2) would be really appreciated.
von John S•
Actually, very interesting and helpful class. The one area around more complex structures (API, XML) warrants more attention, since I assume those are more dominant access methods.
von He S K•
good introduction and practice being given on handling data cleaning. Lesser thought on getting data merely introduction. Still good to give a try if you are new in data analysis.
von Маношин А А•
The course is good, but I have met some inconveniences with week 4 tasks because of bugs in swirl ( they can be met when you in not USA timzone) and not-so-clear course project.
von Sanil S•
learnt a lot of real world applications - fetching data from databases, apis, internet etc and basics of how to tidy data. Addditionally, I am more confident of my R skills now.
von Rodrigo R•
Very good content, but could have more content added.. I had much more free time with this one than what I did with the R Programming. Would be better to have more swirl lessons
von Madanage K P P•
The content was good but to do the assignments you have to search through various other sources. No any assignment can be done by just by going through the lecture materials
von Alexsander L B•
I believe that is possible to improve the presentation, because are missing dinamic in the course and it didn't motivate me to explore more information about it and pratice.