## What is a Word Cloud in Data Visualization

Word Cloud is a visualisation method that displays how frequently words appear in a given body of text, by making the size of each word proportional to its frequency. All the words are then arranged in a...

## What is a Violin Plot in Data Visualization

A Violin Plot is used to visualise the distribution of the data and its probability density. This chart is a combination of a Box Plot and a Density Plot that is rotated and placed on each side, to show...

## What is a Venn Diagram in Data Visualization

A Venn Diagram is a diagram that visually displays all the possible logical relationships between a collection of sets. Each set is typically represented with a circle. Contained within each set is a...

# Category - Data Visualization

Data visualization is the graphic representation of data. It involves producing images that communicate relationships among the represented data to viewers of the images.

## What is a Proportional Area Chart?

Proportional Area Charts usually use squares or circles. However, any shape can be used, so long as you use the shape’s area to represent the data. A common technical error with area charts is to use one length to...

## What is a Population Pyramid in Data Visualization?

A Population Pyramid is a pair of back-to-back Histograms (for each sex) that displays the distribution of a population in all age groups and in both sexes. The X-axis is used to plot population numbers and the Y-axis...

## What is a Pie Chart in Data Visualization?

Extensively used in presentations and offices, Pie Charts help show proportions and percentages between categories, by dividing a circle into proportional segments. Each arc length represents a proportion of each...

## What Is a Data Warehouse?

Data warehousing is one of the hottest topics both in business and in data science. But if you’re new to the field, you’re probably wondering what a data warehouse is, why we need it, and how it works. Don’t worry...

Hi, I am Ned Krastev – co-founder of 365 Data Science, and I am happy to announce the latest release in the 365 Data Science Program – the Introduction to Business Analytics course. In this post, I’ll briefly...

## Data Science Cover Letter Dos and Don’ts

A well-thought-out cover letter can give your job application a powerful edge, especially in the highly competitive field of data science. But what are the most crucial data science cover letter dos and don’ts? In this...

## How to Become a Data Analyst Intern?

Starting off as a data analyst intern is one of the best ways to begin a career in the field of analytics and data science if you don’t have any prior working experience. The benefits of a data analyst internship are...

## Data Engineer Cover Letter Sample and Template

Data Engineer Cover Letter Template An impressive data engineer cover letter can win your job application a decisive victory. When writing a cover letter, make sure to start it in a noteworthy way: you can open your...

## What is a Pictogram Chart in Data Viz?

Pictogram Charts use icons to give a more engaging overall view of small sets of discrete data. Typically, the icons represent the data’s subject or category, for example, data on population would use icons of people...

## Data Preprocessing with NumPy

Hi, my name is Viktor – a Hamilton College graduate with a double degree in Mathematics and Economics, and a course creator at 365 Data Science – and I’m delighted to announce the latest addition to our...

## Interview with Vladimir Ninov, Head of Organic Growth at 365 Data Science

Vladimir Ninov is a marketing professional and Head of Organic Growth at 365 Data Science with rich experience in PR, growth hacking, and fintech. He holds a Master’s degree in Business Administration and has founded...

## Skewness Example

An Example of Skewness The most commonly used tool to measure asymmetry is skewness. This is the formula to calculate it. Almost always, you will use software that performs the calculation for you, so in this lesson, we...

## Conditionals and Loops in Python: Learn how to use them together

Conditional Let’s see how to combine conditionals and loops in Python. To print all the values from 2 to the power of 0, 2 to the power of 1, and so on, until 2 to the power of 9, we can use the following code: for “n”...

## Else if, for Brief – ELIF

In this lesson, we’ll learn an elegant way of adding a second “if” statement to one of our expressions. This is done with the help of the elif keyword, as shown in this example. If y is not greater than 5, the computer...

## Basic Database Terminology

Learning more about basic database terminology is a necessary step that will help us when we start coding. Let’s go through the entire process of creating a database. Assume our database containing customer sales data...

## Database vs Spreadsheet in 2020

I would imagine some of you are Excel users and still think of an Excel or Google spreadsheet when we talk about tabular data. Please, don’t do that! Data tables, databases, and Excel spreadsheets are different things...

## Relational Database Essentials

What is the first thing that comes to your mind when you hear the word “database”? For many people, this question is more challenging than it might seem at first. An answer like “a big file where much information is...

## What Do You Need to Become a Data Scientist in 2019?

It’s hardly a surprise to anyone in the tech and related industries that “data scientist” is the best job to have in the States. After all, this has been what sources like the Harvard Business...

## Population vs Sample

The first step of every statistical analysis you will perform is the population vs sample data check or to determine whether the data you are dealing with is a population or a sample. A population is the collection of...

## VLOOKUP and MATCH another useful Excel functions combination

Feel free to download our Exercise file and practice along with the video. And don’t worry, there is also a Solution file with all the formulas. We have more explainers on advanced Excel functions you might be...

## The simple linear regression model – Geometrical representation

Let’s check out the simple linear regression model equation. Here it is. You have probably heard about the regression line, right? When we plot the data points on an x-y plane, the regression line is the best-fitting...

## What is a Parallel Set in Data Visualization?

Parallel Set charts are similar to Sankey Diagrams in the way they show flow and proportions. However, Parallel Sets don’t use arrows and they divide the flow-path at each displayed line-set. Each line-set corresponds...

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