Skip to main content

15 Best R Programming Interview Questions and Answers

What Is R Programming?
The R is an open source programming language and widely used for statistical computing, graphics, data analytics and scientific research.

The R programming language is most commonly used for developing the statistical software and data analysis.

The R programming was created by Robert Gentleman and Ross Ihaka at the University of Auckland, New Zealand in August 1993; 24 years Ago.
The currently managing and developing all the features and other related to R  - R Development Core Team and Its popularity is grown recent years.

The R programming supports dynamic typing, parallel computing and integration with big data technologies.

What Are the Advantages of R Programming?
The List of the Advantages -
1.      It's used for managing the data.
2.      No license restrictions
3.      It is free and open source.
4.      Graphical capabilities are very good.
5.      and so on

What Are the Disadvantages of R Programming?
The List of Disadvantages -
1.      Lack of standard GUI
2.      Not good for big data
3.      Does not provide spread sheet view of data

How Is Data Import in R Language?
In the R language, Data can be imported in 3 ways such as -
1.      Select the data set or enter the name of the data set which required.
2.      Data is entered directly using the editor of R Commander by using the Data->New Data Set.
3.      Data can also be imported from a URL or from plain text file.

What Are the Data Types in R Language?
The R programming language has a wide variety of data types including scalars, vectors (numerical, character, and logical), matrices, data frames and lists.
The frequently used data types are –
1.      Vectors
2.      Matrices-numeric, character
3.      Arrays
4.      Data Frames
5.      Lists
6.      Factors
7.      Useful Functions
The simplest of these above objects is - Vector Object and there are six data types of these atomic vectors, also termed as six classes of vectors. The other R-Objects are built upon the atomic vectors.

What Are Use of with () and BY () functions in R?
The with () function is used to apply an expression for a given dataset and its looks like –
#with(data,expression)


The by () function is used for applying a function each level of factors and its looks like –
#by(data,factorlist,function)


Why Use R for Statistical Computing and Graphics?
1.      R is open source programming and free!
2.      R runs on all platforms
3.      R is most popular and currently increasing its popularity

How R commands Are Written?
By using the “#” at the starting of the line of code and its looks like “#division” commands is written.

What Is the use of sample () and subset () functions in R?
The sample () function is used to generate a random sample of the size n from a dataset.
The subset () function is used to select the variables and observations

What is t-tests () in R?
It is used to determine that means of two groups are equal or not by using the t.test() function.

I hope you are enjoying with this post! Please share with you friends!! Thank you!!!
By Anil Singh | Rating of this article (*****)

Popular posts from this blog

nullinjectorerror no provider for httpclient angular 17

In Angular 17 where the standalone true option is set by default, the app.config.ts file is generated in src/app/ and provideHttpClient(). We can be added to the list of providers in app.config.ts Step 1:   To provide HttpClient in a standalone app we could do this in the app.config.ts file, app.config.ts: import { ApplicationConfig } from '@angular/core'; import { provideRouter } from '@angular/router'; import { routes } from './app.routes'; import { provideClientHydration } from '@angular/platform-browser'; //This (provideHttpClient) will help us to resolve the issue  import {provideHttpClient} from '@angular/common/http'; export const appConfig: ApplicationConfig = {   providers: [ provideRouter(routes),  provideClientHydration(), provideHttpClient ()      ] }; The appConfig const is used in the main.ts file, see the code, main.ts : import { bootstrapApplication } from '@angular/platform-browser'; import { appConfig } from ...

Top 15+ Angular 17 Interview Questions Answers | For Experienced Professionals as well

G Google team released the latest version of Angular – Angular 17 on November 6, 2023, creating a significant milestone for the super fast front-end development. What Are the New Features in Angular 17? 1.       Angular 17 is the highly anticipated release for the community, bringing many new exciting features, updates, and improvements. 2.       New Syntax for Control Flow in Templates - new @if, @switch, @for, @case, @empty @end control flow syntax 3.       Deferred Loading - @defer partial template 4.       The Angular signals API 5.       Angular SSR and client hydration 6.       Automatic Migration to Build-in Control Flow 7.       Build Performance with ESBuild 8.       By default, set this newly generated component as a standalone, and now we don't have an app module file. To use (ng...

SOLID-Liskov Substitution Principle (LSP) Real-Time Example in C#

The SOLID Principles are the design principles that enable us to manage several software design problems. These principles provide us with ways to move from tightly coupled code to loosely coupled and encapsulated real business needs properly. Also readable, adaptable, and scalable code. The SOLID Principles  guide developers as they write readable, adaptable, and scalable code or design an application. The SOLID Principles can be applied to any OOP program. The SOLID Principles were developed by computer science instructor and author Robert C. Martin. Now, SOLID principles have also been adopted in both agile development and adaptive software development. The 5 principles of SOLID are: 1.       Single Responsibility Principle (SRP) 2.       Open-Closed Principle (OCP) 3.       Liskov Substitution Principle (LSP) 4.       Interface Segregation Principle (ISP) 5. ...

39 Best Object Oriented JavaScript Interview Questions and Answers

Most Popular 37 Key Questions for JavaScript Interviews. What is Object in JavaScript? What is the Prototype object in JavaScript and how it is used? What is "this"? What is its value? Explain why "self" is needed instead of "this". What is a Closure and why are they so useful to us? Explain how to write class methods vs. instance methods. Can you explain the difference between == and ===? Can you explain the difference between call and apply? Explain why Asynchronous code is important in JavaScript? Can you please tell me a story about JavaScript performance problems? Tell me your JavaScript Naming Convention? How do you define a class and its constructor? What is Hoisted in JavaScript? What is function overloadin...

List of Countries, Nationalities and their Code In Excel File

Download JSON file for this List - Click on JSON file    Countries List, Nationalities and Code Excel ID Country Country Code Nationality Person 1 UNITED KINGDOM GB British a Briton 2 ARGENTINA AR Argentinian an Argentinian 3 AUSTRALIA AU Australian an Australian 4 BAHAMAS BS Bahamian a Bahamian 5 BELGIUM BE Belgian a Belgian 6 BRAZIL BR Brazilian a Brazilian 7 CANADA CA Canadian a Canadian 8 CHINA CN Chinese a Chinese 9 COLOMBIA CO Colombian a Colombian 10 CUBA CU Cuban a Cuban 11 DOMINICAN REPUBLIC DO Dominican a Dominican 12 ECUADOR EC Ecuadorean an Ecuadorean 13 EL SALVA...