It's a good course for basic training, but the price is questionable. Since it's a course from 2017, some packages don't install, and there are no updates for this either...

seunghalee12260892

Learn the essentials of using R beyond the basics, from package installation to loops, user functions, and removing missing and outliers. You can also repeat the learning by solving quizzes.

datadoctor

[Give R to R] R Intermediate

패키지 설치부터 반복문,사용자함수,결측치ㆍ이상치 제거까지 기초과정을 넘어 R을 사용하는 데 필수적인 내용을 배워보세요. 퀴즈를 풀면서 반복학습도 가능합니다.