R certification

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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:
  • Clients[1,2]
  • Clients[c(1,2)]
  • Clients[,c(1,2)]
  • Clients[c(1,2),]

What is the value of the following expression? 2+NA

Choose one:
  • NA
  • Null
  • "2"
  • "0"

Which function would you use to compare two means?

Choose one:
  • f.test
  • aov
  • meantest
  • t.test

Our certificates

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.

PDF version:
Online competence badge:
Certified in R
2017-11-18 #xxxx-xxx-xxx-xxx

Price: $5

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