Why you should use R online test?

The R online test makes use of scenario-based questions to test for on-the-job skills as opposed to theoretical knowledge, ensuring that candidates who do well on this screening test have the relavant skills. The questions are designed to covered following on-the-job aspects: Arbejde med vektorer Udførelse af operationer på matrixer Analyse af dataframes Import og eksport af CSV -filer Implementering af lineære regressionsmodeller Fortolkning af forvirringsmatrixer Anvendelse af tilfældige skovalgoritmer Brug af analyseteknikker Udførelse af strengmanipulation

R online test

About the test:

Den R Online-test bruger scenariebaserede MCQ'er til at evaluere kandidater om deres viden om R-programmeringssprog, herunder deres færdigheder i at arbejde med datastrukturer, kontrolstrukturer, funktioner og datavisualisering ved hjælp af R-biblioteker som GGPLOT2. Testen inkluderer et kodningsspørgsmål til evaluering af praktiske programmeringsevner og sigter mod at evaluere en kandidats evne til at arbejde med R effektivt til dataanalyse og statistisk modellering.

Covered skills:

Vektorer
Dataframes
Lineær regression
Tilfældig skov
Strengmanipulation

Matrixer
CSV -håndtering
Forvirringsmatrix
Analytics med r

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9 reasons why

Adaface R Test is the most accurate way to shortlist Dataforskers

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 time by filtering out unqualified candidates at the first step of the hiring process.

The test screens for the following skills that hiring managers look for in candidates:

Effektivt arbejde med vektorer
Arbejder med matrixer til datamanipulation
Håndtering og analyse af data ved hjælp af Dataframes
Håndtering af CSV -filer og datahåndtering
Anvendelse af lineære regressionsmodeller i R
Forståelse og anvendelse af forvirringsmatrixer
Implementering af tilfældige skovalgoritmer i R
Udfører analyseopgaver ved hjælp af R
Manipulering og transformerende strenge i R

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.

View sample questions

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

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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.

How we design questions

Dette er kun en lille prøve fra vores bibliotek med 10.000+ spørgsmål. De faktiske spørgsmål om dette R online test vil være ikke-gåbart.

🧐 Question
Medium Applying Functions Data frames Functions Math	Solve
Consider the following R code: This script defines a function apply_fun that calculates the mean of a vector and adds it to the standard deviation of the vector. The apply function is then used to apply this function to each column of the data frame df. What will be the value of result after the script is run?
Medium Dataframe Transform	Solve
Review the following Dataframe 'bazinga': Which of the following commands would turn it into the Dataframe shown below:
Medium Matrix Manipulation Matrices Lists	Solve
Consider the following pseudo code: What will be the state of list_of_matrices after running the script?
Easy Registration Queue Logic Queues	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
Medium Visitors Count Strings Logic	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

	🧐 Question	🔧 Skill
	Medium Applying Functions Data frames Functions Math	3 mins R	Solve
Consider the following R code: This script defines a function apply_fun that calculates the mean of a vector and adds it to the standard deviation of the vector. The apply function is then used to apply this function to each column of the data frame df. What will be the value of result after the script is run?
	Medium Dataframe Transform	3 mins R	Solve
Review the following Dataframe 'bazinga': Which of the following commands would turn it into the Dataframe shown below:
	Medium Matrix Manipulation Matrices Lists	3 mins R	Solve
Consider the following pseudo code: What will be the state of list_of_matrices after running the script?
	Easy Registration Queue Logic Queues	30 mins Coding	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
	Medium Visitors Count Strings Logic	30 mins Coding	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

	🧐 Question	🔧 Skill	💪 Difficulty	⌛ Time
	Applying Functions Data frames Functions Math	R	Medium	3 mins	Solve
Consider the following R code: This script defines a function apply_fun that calculates the mean of a vector and adds it to the standard deviation of the vector. The apply function is then used to apply this function to each column of the data frame df. What will be the value of result after the script is run?
	Dataframe Transform	R	Medium	3 mins	Solve
Review the following Dataframe 'bazinga': Which of the following commands would turn it into the Dataframe shown below:
	Matrix Manipulation Matrices Lists	R	Medium	3 mins	Solve
Consider the following pseudo code: What will be the state of list_of_matrices after running the script?
	Registration Queue Logic Queues	Coding	Easy	30 mins	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
	Visitors Count Strings Logic	Coding	Medium	30 mins	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

Reason #4

1200+ customers in 75 countries

Med Adaface var vi i stand til at optimere vores indledende screeningsproces med op mod 75 %, hvilket frigjorde kostbar tid for både ansættelsesledere og vores talentanskaffelsesteam!

Brandon Lee, Leder af mennesker, Love, Bonito

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Reason #5

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.

Science behind Adaface tests

Reason #6

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 #7

Detailed scorecards & benchmarks

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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

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About the R Assessment Test

Why you should use Pre-employment R online test?

The R online test makes use of scenario-based questions to test for on-the-job skills as opposed to theoretical knowledge, ensuring that candidates who do well on this screening test have the relavant skills. The questions are designed to covered following on-the-job aspects:

Arbejde med vektorer
Udførelse af operationer på matrixer
Analyse af dataframes
Import og eksport af CSV -filer
Implementering af lineære regressionsmodeller
Fortolkning af forvirringsmatrixer
Anvendelse af tilfældige skovalgoritmer
Brug af analyseteknikker
Udførelse af strengmanipulation

Once the test is sent to a candidate, the candidate receives a link in email to take the test. For each candidate, you will receive a detailed report with skills breakdown and benchmarks to shortlist the top candidates from your pool.

What topics are covered in the R online test?

matrixer
matrixer i R er to-dimensionelle arrays, der lagrer elementer af samme type. Denne færdighed vil evaluere en kandidats evne til at skabe og manipulere matrixer, udføre matrixoperationer såsom tilføjelse, subtraktion og multiplikation og anvende matrixoperationer til løsning af problemer.
dataframes
dataframes er er Tabulære datastrukturer i R, der gemmer data i rækker og kolonner. At vurdere en kandidats viden om dataframes vil konstatere deres dygtighed i datamanipulation, herunder sammenlægning, filtrering og transformering af data samt deres forståelse af data omformning.
CSV -håndtering
CSV ( Kommasparerede værdier) Håndtering er evnen til at læse, skrive og manipulere data, der er gemt i CSV-format. Denne færdighed er afgørende i virkelige livsscenarier, hvor data ofte udveksles og gemmes i CSV-filer. Evaluering af denne færdighed vil bestemme en kandidats færdigheder i belastning, redning og udførelse af datatransformationer på CSV -filer i r.
lineær regression
lineær regression er en statistisk teknik, der bruges til at analysere forholdet mellem en afhængig variabel og en eller flere uafhængige variabler. Måling af en kandidats forståelse af lineær regression vil vurdere deres evne til at passe til lineære regressionsmodeller, fortolke modeludgange og foretage forudsigelser ved hjælp af modellerne.
forvirringsmatrix
En forvirringsmatrix er et bord Det repræsenterer ydelsen af en klassificeringsalgoritme. Måling af en kandidats viden om forvirringsmatrixer vil evaluere deres forståelse af nøglemetrik, såsom nøjagtighed, præcision, tilbagekaldelse og F1 -score, og deres evne til at analysere og fortolke klassificeringsresultater.
Full list of covered topics
The actual topics of the questions in the final test will depend on your job description and requirements. However, here's a list of topics you can expect the questions for R online test to be based on.
Vektorer
Matrixer
Dataframes
CSV -håndtering
Lineær regression
Forvirringsmatrix
Tilfældig skov
Analytics med r
Strengmanipulation
Vektoroperationer
Matrix -operationer
Dataframe -manipulation
Læsning og skrivning af CSV -filer
Enkel lineær regression
Flere lineære regression
Fortolkning af forvirringsmatrixer
Tilfældig skovalgoritme
Klassificering og regressionstræer (vogn)
Klyngeralgoritmer
Dataudforskning og visualisering
Datarensning og forarbejdning
Statistisk analyse i R
Tekstmanipulation og ekstraktion
Regelmæssige udtryk
Streng matchning
Manglende datahåndtering
Dataaggregering og omformning
Håndtering af tidsseriedata
Dimensionalitetsreduktionsteknikker
Statistiske modelleringsteknikker i R
Håndtering af outliers og afvigelser
Data mining og maskinlæring
Funktionsvalg og variabel betydning
Modelevaluering og validering
Måling af præstationsmåling
Krydsvalideringsteknikker
Hyperparameterindstilling
Data -imputationsteknikker
Webskrabning og API'er i R
Databaser og SQL -integration i R
Geospatial analyse og kortlægning
Datavisualisering med GGPLOT2
Statistiske tests og hypotesetest
Prognoser for tidsserier
Natural Language Processing (NLP)
Billedbehandling og computervision
Big Data Analytics med R
Dyb læring og neurale netværk
Parallel computing og præstationsoptimering
R Shiny App Development
Reproducerbar forskning med R Markdown
Versionskontrol med git og github
Samarbejdsdatavidenskab med Rstudio
Skalerbar analyse ved hjælp af Sparkr
Cloud computing og R -integration
Oprettelse af interaktive dashboards med skinnende
Avancerede datavisualiseringsteknikker
Grafanalyse og sociale netværksdata
Bayesian statistik og inferens i R

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What roles can I use the R online test for?

Dataforsker
Dataanalytiker
Core R -udvikler
Core R -programmør
Python -udvikler
Machine Learning Engineer

How is the R online test customized for senior candidates?

For intermediate/ experienced candidates, we customize the assessment questions to include advanced topics and increase the difficulty level of the questions. This might include adding questions on topics like

Mastering af datavisualisering
Implementering af maskinlæringsalgoritmer
Anvendelse af dataminingsteknikker
Arbejder med tidsseriedata
Udførelse af rengøring og forarbejdning
Forståelse af statistisk inferens
Anvendelse af optimeringsteknikker
Anvendelse af naturlig sprogbehandling
Brug af parallel computing

The coding question for experienced candidates will be of a higher difficulty level to evaluate more hands-on experience.

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Ansættelseslederne mente, at de gennem de tekniske spørgsmål, som de stillede under panelinterviewene, var i stand til at fortælle, hvilke kandidater der havde bedre score og differentieret med dem, der ikke scorede så godt. De er meget tilfreds med kvaliteten af de kandidater, der er nomineret med Adaface-screeningen.

85%

Reduktion i screeningstid

Se den fulde casestudie

R Hiring Test Ofte stillede spørgsmål

Kan jeg kombinere flere færdigheder i en brugerdefineret vurdering?

Ja absolut. Brugerdefinerede vurderinger er oprettet baseret på din jobbeskrivelse og vil omfatte spørgsmål om alle must-have-færdigheder, du angiver.

Har du nogen anti-cheating eller proctoring-funktioner på plads?

Vi har følgende anti-cheating-funktioner på plads:

Ikke-gåbare spørgsmål
IP Proctoring
Webproctoring
Webcam Proctoring
Detektion af plagiering
Sikker browser

Læs mere om Proctoring Features.

Hvordan fortolker jeg testresultater?

Den primære ting at huske på er, at en vurdering er et elimineringsværktøj, ikke et udvælgelsesværktøj. En færdighedsvurdering er optimeret for at hjælpe dig med at eliminere kandidater, der ikke er teknisk kvalificerede til rollen, den er ikke optimeret til at hjælpe dig med at finde den bedste kandidat til rollen. Så den ideelle måde at bruge en vurdering på er at beslutte en tærskelværdi (typisk 55%, vi hjælper dig med benchmark) og inviterer alle kandidater, der scorer over tærsklen for de næste interviewrunder.

Hvilken oplevelsesniveau kan jeg bruge denne test til?

Hver Adaface -vurdering tilpasses til din jobbeskrivelse/ ideel kandidatperson (vores emneeksperter vælger de rigtige spørgsmål til din vurdering fra vores bibliotek på 10000+ spørgsmål). Denne vurdering kan tilpasses til ethvert erfaringsniveau.

Får hver kandidat de samme spørgsmål?

Ja, det gør det meget lettere for dig at sammenligne kandidater. Valgmuligheder for MCQ -spørgsmål og rækkefølgen af spørgsmål randomiseres. Vi har anti-cheating/proctoring funktioner på plads. I vores virksomhedsplan har vi også muligheden for at oprette flere versioner af den samme vurdering med spørgsmål om lignende vanskelighedsniveauer.