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学生对 Johns Hopkins University 提供的 Getting and Cleaning Data 的评价和反馈

4.5
8,070 个评分

课程概述

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....

热门审阅

CW

Aug 6, 2020

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.

RR

Jul 9, 2017

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.

筛选依据:

801 - Getting and Cleaning Data 的 825 个评论(共 1,313 个)

创建者 zhao m

Oct 31, 2016

good.

创建者 Albert C G

Sep 2, 2016

Great

创建者 SAI D B

Jan 1, 2022

good

创建者 �SADHARAN G

Jul 17, 2020

good

创建者 Fahim F S

Apr 26, 2020

good

创建者 Manav S

Jan 3, 2020

good

创建者 Udom A

Dec 30, 2019

Good

创建者 Pitak P

Oct 4, 2019

Good

创建者 Santi M

Apr 21, 2019

good

创建者 Sangdon C

Oct 11, 2018

good

创建者 Anup K M

Sep 15, 2018

good

创建者 Jay B

Aug 8, 2017

good

创建者 Oleksandr F

Nov 24, 2016

Nice

创建者 Abhinav S

May 29, 2016

Nice

创建者 Tian A

Apr 5, 2016

cool

创建者 James M

Mar 13, 2016

good

创建者 朱荣荣

Mar 9, 2016

good

创建者 Isura N

Dec 8, 2017

yes

创建者 Amit K R

Nov 20, 2017

ok

创建者 Naveen J

Aug 9, 2019

0

创建者 Ловягина Ю А

May 16, 2019

C

创建者 Anil G

Oct 22, 2017

E

创建者 Jihee Y

Nov 12, 2016

g

创建者 Klipped K

Jan 2, 2017

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). I spent tons of time researching, looking at the forums, and programming documentation. Going into this course, I was surprised about how much I knew when it came to the quizzes and how my time looking at all the resources above decreased and I actually knew where to begin! 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). However, it does challenge you to think and reflect on your knowledge. You probably won't understand 100% of what is in the course (especially the project) but you will LEARN especially if you are totally NEW to programming like me! My knowledge has increased and that is what I was hoping for. If you have those same hopes and do not mind not getting 100%'s on all quizzes/projects this course is for you. Do be mindful that I personally feel that this course requires more than 4-6 hours per week especially for beginners. I spent more than 24 hours on week 4 alone.

创建者 Marcelo A M

May 2, 2020

Aunque el curso es muy bueno y lo recomiendo a cualquiera que quiera hacer una carrera como Data Scientist, tiene algunos problemas completamente solucionables, por ejemplo en algunas de las clases que muestran el uso de paquetes problemáticos y que son completamente prescindibles para el 99% de los casos. Además no hay orientación para los sistemas Linux, y siendo un curso sobre una herramienta open-source me parece una triste omisión. Dicho esto, el curso es muy bueno, y te va a enseñar a lidiar con datos desordenados y con distintos formatos de datos. No lo recomendaría para alguien que no tiene experiencia previa en R.

Although the course is very good and I recommend it to anyone who wants to pursue a career as a Data Scientist, it has some completely solvable problems, i.e. some of the classes that show the use of problematic packages and that are completely expendable for 99% of cases. Also there is no guidance for Linux systems, and being a course on an open-source tool seems to me a sad omission. That said, the course is very good, and it will teach you how to deal with messy data and different data formats. I would not recommend it for someone who has no previous experience in R.