Our R test will help you understand your proficiency with the R programming language and environment for statistical computing and graphics. This test covers the following topics: Vectors, Matrices, Lists, Data Frames, Factors and Tables, R Programming Structures and Functions, Input/Output. Difficulty level: for experienced programmers.
Number of questions: 100
Time limit for question: 60 seconds
Which expression would you use to select two columns from the Clients data frame?Choose one:
What is the value of the following expression? 2+NAChoose one:
Which function would you use to compare two means?Choose one:
Getting your career started and need to impress a potential employer? We can conduct any of our tests in a manner that will allow us to verify your identity and check that the test result is indeed your own work. If you pass the test, we will issue a certificate just like the one pictured. You will be then able to obtain both an electronic certificate suitable for sharing on Facebook and Linkedin, a corresponding badge on your personal page, and a downloadable PDF version for printing.
Certificate authencity can be verified with a special tool. Simply enter the certificate ID to verify claims of completion.