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About the test:

The R Online Test is preferred by recruiters to assess on-the-job skills of candidates before an interview. It reduces technical screening time by 80% by enabling employers to identify qualified candidates.

Covered skills:

  • Vector
  • Dataframe
  • Matrix
  • CSV
See all covered skills

9 reasons why
9 reasons why

Adaface R Online Test is the most accurate way to shortlist Data Scientists



Reason #1

Tests for on-the-job skills

The R Online Test helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves expensive engineering time by filtering out unqualified candidates.

The Adaface R Online test screens candidates for the typical skills recruiters look for in an R programmer:

  • Strong programming experience and data management using SAS and R
  • Ability to work with large datasets
  • Ability to solve analytical problems using quantitative approaches
  • Experience with using machine learning methods and models

The insights generated from this assessment can be used by recruiters and hiring managers to identify the best candidates for the role. Anti-cheating features enable you to be comfortable with conducting assessments online. The R developer test is ideal for helping recruiters identify which candidates have the technical skills to do well on the job.

Reason #2

No trick questions

Traditional assessment tools use trick questions and puzzles for the screening, which creates a lot of frustration among candidates about having to go through irrelevant screening assessments.

The main reason we started Adaface is that traditional pre-employment assessment platforms are not a fair way for companies to evaluate candidates. At Adaface, our mission is to help companies find great candidates by assessing on-the-job skills required for a role.

Why we started Adaface ->
Reason #3

Non-googleable questions

We have a very high focus on the quality of questions that test for on-the-job skills. Every question is non-googleable and we have a very high bar for the level of subject matter experts we onboard to create these questions. We have crawlers to check if any of the questions are leaked online. If/ when a question gets leaked, we get an alert. We change the question for you & let you know.

These are just a small sample from our library of 10,000+ questions. The actual questions on this R Online Test will be non-googleable.

🧐 Question

Easy

CSV load data
Solve
                        Consider the following file:
                        
 image
                        The file might have incomplete data stored with ! or ?. Which of the following R snippets will load the file completely?
                        
 image

Medium

Dataframe Transform
Solve
                        Review the following Dataframe 'bazinga':
                        
 image
                        Which of the following commands would turn it into the Dataframe shown below:
                        
 image
 image

Medium

Longest Road
logic
hashmaps
Solve
                        A startup company E-Motors is building driverless automated cars. The car contains a sensor that checks the road quality for the next N meters to decide the optimal speed at which the cars should move. We are given recorded data by the sensor in the form of an array, where each element of the array is the rating given to 1 meter of the road in sequence. 

The rating given by the sensor is from 1 to 100, where 100 represents the road with the best condition, and any rating above 60 is optimal. Find the longest stretch of road in meters that is categorized as optimal by the sensor.

The input is an array of "strings" which needs to be converted from string to integer/number inside the function.
🧐 Question🔧 Skill

Easy

CSV load data
2 mins
R
Solve

Medium

Dataframe Transform
3 mins
R
Solve

Medium

Longest Road
logic
hashmaps
25 mins
Coding
Solve
🧐 Question🔧 Skill💪 Difficulty⌛ Time
CSV load data
R
Easy2 mins
Solve
Dataframe Transform
R
Medium3 mins
Solve
Longest Road
logic
hashmaps
Coding
Medium25 minsSolve
Reason #4

1200+ customers in 75 countries

Brandon

With Adaface, we were able to optimise our initial screening process by upwards of 75%, freeing up precious time for both hiring managers and our talent acquisition team alike!


Brandon Lee, Head of People, Love, Bonito

Reason #5

1 click candidate invites

Email invites: You can send candidates an email invite to the R Online Test from your dashboard by entering their email address.

Public link: You can create a public link for each test that you can share with candidates.

API or integrations: You can invite candidates directly from your ATS by using our pre-built integrations with popular ATS systems or building a custom integration with your in-house ATS.

Reason #6

Detailed scorecards & comparative results

Reason #7

Designed for elimination, not selection

The most important thing while implementing the pre-employment R Online Test in your hiring process is that it is an elimination tool, not a selection tool. In other words: you want to use the test to eliminate the candidates who do poorly on the test, not to select the candidates who come out at the top. While they are super valuable, pre-employment tests do not paint the entire picture of a candidate’s abilities, knowledge, and motivations. Multiple easy questions are more predictive of a candidate's ability than fewer hard questions. Harder questions are often "trick" based questions, which do not provide any meaningful signal about the candidate's skillset.

Reason #8

High completion rate

Adaface tests are conversational, low-stress, and take just 25-40 mins to complete.

This is why Adaface has the highest test-completion rate (86%), which is more than 2x better than traditional assessments.

Reason #9

Advanced Proctoring


About The R Developer Role

R is an open-source programming language that is widely used among statisticians for developing statistical software, data analysis, and scientific research. R is not the only language that can be used for statistical computing. Some of the popular alternatives of R programming include Python, SAS (Statistical Analysis System), and SPSS (Software Package for Statistical Analysis).

Typical R programmer responsibilities include:

  • Designing and developing technical architecture, requirements, and statistical models
  • Supporting the technical team in the development of automated processes for data extraction and analysis
  • Preparing the codebase with scripts to ensure proper data access, manipulation, and reporting functions with R programming languages
  • Supporting users by developing documentation and assistance tools

What roles can I use the R Online Test for?

  • Data Scientist
  • Data Analyst
  • Core R Developer
  • Core R Programmer
  • Python Developer
  • Machine Learning Engineer

What topics are covered in the R Online Test?

Analytics with R & tools
Introduction to Statistics
Data Manipulation using R
Machine Learning Techniques using R
Exploratory Data Analysis
Regression Analysis
Data Science Basics
String Manipulation
Vector
Matrix
Dataframe
CSV
Rmarkdown
linear regression

A confusion matrix can be used to evaluate the accuracy of the model built.

confusion matrix
Random Forest
Analytics with R & tools
package
R6 Class
shinyR

The apply function allows one to make entry-by-entry changes to data frames and matrices.

apply function
Clustering
kmeans clustering
hierarchical clustering

Rattle is a popular GUI for data mining using R.

rattle
White Noise model

Principal Component Analysis is a method for dimensionality reduction.

Principal Component Analysis

initialize() function is used to initialize the private data members while declaring the object.

initialize()
evaluate_model()
Predictive Mean Matching
preloaded datasets
next
custom function
by()
factor variable
Radix
R decision tree
Data import
Singapore government logo

The hiring managers felt that through the technical questions that they asked during the panel interviews, they were able to tell which candidates had better scores, and differentiated with those who did not score as well. They are highly satisfied with the quality of candidates shortlisted with the Adaface screening.


85%
reduction in screening time

FAQs

Can I combine multiple skills into one custom assessment?

Yes, absolutely. Custom assessments are set up based on your job description, and will include questions on all must-have skills you specify.

Do you have any anti-cheating or proctoring features in place?

We have the following anti-cheating features in place:

  • Non-googleable questions
  • IP proctoring
  • Web proctoring
  • Webcam proctoring
  • Plagiarism detection
  • Secure browser

Read more about the proctoring features.

How do I interpret test scores?

The primary thing to keep in mind is that an assessment is an elimination tool, not a selection tool. A skills assessment is optimized to help you eliminate candidates who are not technically qualified for the role, it is not optimized to help you find the best candidate for the role. So the ideal way to use an assessment is to decide a threshold score (typically 55%, we help you benchmark) and invite all candidates who score above the threshold for the next rounds of interview.

What experience level can I use this test for?

Each Adaface assessment is customized to your job description/ ideal candidate persona (our subject matter experts will pick the right questions for your assessment from our library of 10000+ questions). This assessment can be customized for any experience level.

Does every candidate get the same questions?

Yes, it makes it much easier for you to compare candidates. Options for MCQ questions and the order of questions are randomized. We have anti-cheating/ proctoring features in place. In our enterprise plan, we also have the option to create multiple versions of the same assessment with questions of similar difficulty levels.

I'm a candidate. Can I try a practice test?

No. Unfortunately, we do not support practice tests at the moment. However, you can use our sample questions for practice.

What is the cost of using this test?

You can check out our pricing plans.

Can I get a free trial?

Yes, you can sign up for free and preview this test.

I just moved to a paid plan. How can I request a custom assessment?

Here is a quick guide on how to request a custom assessment on Adaface.

Join 1200+ companies in 75+ countries.
Try the most candidate friendly skills assessment tool today.
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Ready to use the Adaface R Online Test?
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40 min tests.
No trick questions.
Accurate shortlisting.
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