Getting and Cleaning Data

The Course Project was daunting at first, but I reviewed my notes over and over again, tried reading from the site where the raw data was made available and constructed images of how the TIDY data should look like.

So honestly, I feel like I'm being ripped off a bit here.I did really enjoy the course project though.

Excelente Course Project was absolutely brilliant!

So, when I took a course project, I was struggling to find 'what should I do'.

However, the course project only involves reading data from several txt files and combining them into a single R dataset.

So you can do the course project without understanding anything covered in weeks 1 and 2 of the 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.

Well structured Great coverage of useful R libraries for retrieving and tidying up data, and difficult but valuable course project.

Materials (video and written) only partially prepare the student for the quizzes and course projects.

The last course in this specialization had me second guessing myself on whether or not I could do this (based on how difficult the quizzes/course project was).

The course project was still VERY difficult for this beginning specialization compared to what information is given in the lectures (spent over 16 hours on it and still didn't meet ALL criteria).

I learned a lot!

good intro to R yes very difficult, but I learned a lot The course material needs update.

It is a topic which is very often underestimated and we all need to learn to get more productive on this, as most of the time is spend on it in the "real world".Thanks Learned a lot This course covers the essential Explanation could be more elaborated like the earlier courses Great course to take !

Have learned a lot and discovered powerful tools and approaches.

Very useful I learned a lot.

learned a lot about cleaning data Quite disappointed at 'Getting data' part because of lack of explanation(I only had to learn extra sources to understand) but satisfied with 'Cleaning data' part.

Very practical course I learned a lot from this course and can see its practical applications.

Learned a lot, manipulating real data sets to produce "tidy" data sets, suitable for analysis.

I learned a lot from it!

A thorough course on how to structure and clean dirty data before making analyses on the data - very practical course in R. Learned a lot!

Good course, learned a lot especially through the quizzes and the course project, but slides/presentations could be more engaging.

I worked hard, and I learned a lot.

Nice Course Excellent course It gave me an overview of how to getting and cleaning data.The course is best suited for anyone who is a novice in data science A good course great course, very useful and insightful; challenging final project.

Before taking "Getting and Cleaning Data", I had no prior R programming experience aside from completing the R programming course in the data science specialization on Coursera.

I feel that getting and cleaning data course is highly important to know since this is where 80% of the work in data science is being done.

Excellent information on getting and cleaning data.

gets you through the basics and beyond in getting and cleaning data from diverse sources.

Brief instroduction of getting and cleaning data.

Exellent course, which brings you to the next level of a Data Scientist.Getting and Cleaning data principles can be used in alot of situations.

It should provide a high-level approach to "getting and cleaning data"....and how it fits into the high-level roadmap of what Data Scientists do.

There are quite a few issues with the final assignment of the Getting and Cleaning Data course.

good Hi all, Course provides interesting insight to getting and cleaning data.

Thanks for this wonderful session on Getting and Cleaning Data.

Getting and cleaning data is the third course in the first wave of John Hopkins’s data science specialization track on Coursera.

I learnt how to get the data from the web sources other than reading files of various formats, manipulate and group the data, and how to prepare a tidy data set for future analysis.

This is a terrific course on obtaining data from various sources and then cleaning the raw data obtained to form useful tidy data sets.

How do you develop a plan to build a tidy data set (i.e.

Learning how to create a tidy Data set was one of the perks in this course The code for the final assignment is peer reviewed which doesn't make sense.

In weeks two and three, the course presents a list of data format and how to read them into R. I would have preferred a better description on why tidy data sets are considered tidy that included some side-by-side comparisons and downstream effects of untidy data.

C The course has valuable content, but there is not enough emphasis on how to create a tidy data set.

You kind of learn what a tidy data set is (although the definition is vauge), but you would need to see examples of messy data sets and how to convert it to tidy data set.

The principles of a tidy data set might seem like common sense, but in practice it's more challenging than you might think.

I highly recommend taking this course even if you think you know what a tidy data set is.

Interesting enough, when looking at the solutions during the peer reviews, they seem to have found way easier solutions than I had.

What concerns me is that they all had similar issues, and are all doing peer review of each other - this means that there is no one that can make sure that their answers are really tidy...

Peer reviewed assessment with students who are unsure of the correct answers = unsure if solution is correct.

The lecture material was high level, and didn't seem to be a good preparation for the quizzes.The description for the final project was not very detailed, and the grading rubric likewise was not very specific for peer review.

The course project is a total letdown, uninteresting and badly worded leading to a total chaos in peer reviewing.

idea what they want for the project and the discussion forum is clogged with people asking for peer reviews.

I really liked this course and believe that my work, although seemingly noob-ish, will get much better as I see others works from the peer review and examples noted in the lessons.

The instructions are quite open to interpretation, which means that the final grade which you get via peer review is always going to be debatable.

The instructors didn't respond to questions on the discussion forums about quiz items, the majority of assessment items seem to be available on Google and 50% of the peer reviewed assessment I checked used plagiarized solutions.

To make the situation even worse, THE TEACHERS SHOW ABSOLUTELY NO SUPPORT on the discussion forums.

My issues in dealing with these errors would have been alleviated had the professor advocated use of the discussion forums as a good place to discuss issues with the quizzes, errors, software, and more.

As I found in the Maps Coursera course I took, the discussion forums are a great place to supplement your learning from the course.

Overall I learned: -methods for good variable naming -lots about R programming -manipulating data and reading various forms (csv, xml, sql, etc... ) into R -merging data -keeping just the data you need, deleting what you don't need -dealing with null values While the course had frequent frustrating moments, I would say that I did learn a lot, but in order for the course to be more effective, the lectures need to be drastically re-tooled and the discussion forums need to be used to their full potential.

), but it certainly lead to a lot of confusion in the interpretation of the instructions, a sentiment reflected in the discussion forums.

I had to struggle a bit on the project but the discussion forums and a little online search was able to help me get to the right answers.

Instead, you'll spend much of your time scurrying around, trying to figure out why what you see on the lecture notes isn't working on your computer.

Either you will spend a MUCH larger time than advertised trying to figure things out on your own (which will give other benefits if you are new to the topic or R, if you have the patience), or you go on to the discussion forums because invariably others have the exact same confusion.

Thanks Johns Hopkins.

This is the 3rd course in the "Data Science" track, and it continues the tradition that we have come to expect of the Johns Hopkins' Stats/DataSci courses, namely, that of being half assed and almost entirely useless.

This course was as equally bad as the rest of the courses in the "Data Science" track through Johns Hopkins University.

This is my third course completed in the Data Science Specialization offered by Johns Hopkins.

Thanks Coursera and Johns Hopkins University for making this happen!

Overall very good but the class does not teach enough to make the course work easy to figure out.

Yes, I know you're supposed to do research to help figure out problems, and I have.

As a matter of fact, I have taken other courses on data wrangling to be able to figure out this problem.

Also, one of the worst explanations of regular expressions I've ever heard.

Week 4 involves string manipulation, regular expressions and working with the Dates.

A lot of this is covered in Roger Peng's ebooks "R Programming for Data Science" and "Mastering Software Development in R" (both are freely available- google them).Assessments: The only assessments in the course are 4 quizzes- each of which involves about 5 short programming exercises- and a final project which only involves topics from weeks 3 and 4 (specifically- subsetting data, sorting data, reshaping data, and working with regular expressions).

The course also discusses subsetting data, adding variables, merging data, regular expressions and working with dates.

This is really R part 2, getting into file/API handling, data frames, regular expressions etc.

But I think some important issues in the real world are not discussed enough here, like how to treat missing values, how to deal with messy format data.

They do not even bother provide any useful information (god knows why, maybe they're trying to mimic "real world conditions" but in real world you can interact with users...

The final project pretty fairly replicated what happens in the real world when you are given a disgustingly awful looking data set and are asked to do something with it.

It's a good course, with right amount of exercises and well explained classes.

Honestly, I wanted to give complete 5 rating to this course, because the content of the lecture is well explained.

Although I understand that the lecturer did not want to explain every data type, some concepts were not very well explained (e.g.

Well explained.