Posts by: Elena Kosourova

Python Exceptions: The Ultimate Beginner’s Guide (with Examples)

This tutorial covers exceptions in Python, including why they occur, how to identify them, and how to resolve them. In this tutorial, we will define exceptions in Python, we will identify why they are important and how they differ from syntax errors, and we will learn how to resolve exceptions in Python. What Are Exceptions […]

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Apply Functions in R with Examples [apply(), sapply(), lapply (), tapply()]

In this tutorial, we’ll learn about the apply() function in R, including when to use it and why it’s more efficient than loops. The apply() function is the basic model of the family of apply functions in R, which includes specific functions like lapply(), sapply(), tapply(), mapply(), vapply(), rapply(), bapply(), eapply(), and others. All of […]

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How to Create a Dataframe in R with 30 Code Examples (2022)

DataFrames are essential data structures in the R programming language. In this tutorial, we’ll discuss how to create a dataframe in R. A DataFrame in R is a tabular (i.e., 2-dimensional, rectangular) data structure used to store values of any data type. It’s a data structure of the base R, meaning that we don’t have […]

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25 Must-Know Power BI Interview Questions and Answers (2022)

Power BI Interview Questions: Beginner Level Let’s start with the most basic questions. Simple as they may seem to you, it’s always a good idea to be prepared with a confident, comprehensive, and concise answer for each of them. 1. What is Power BI? Power BI is a cloud-based business intelligence and data visualization software […]

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The Easy Way to Install a Package in R (with 8 Code Examples)

R is a powerhouse programming language with many data science applications. But before we can put its packages to work, we need to install them. Here’s how. R is a programming language for statistical computing, especially efficient for performing data science tasks. This popularity is because R offers an impressive choice of data science-oriented packages, […]

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