It is possible to read data and make comparisons using a bar chart. This type of graph, called a dual bar chart, shows the eye colour of year 7 and year 8 students.

But beware the temptation to make a humble bar chart look more interesting by adding a 3D effect. As you already saw, 3D charts distort perception and make it harder to find a reference point.

William Playfair, the father of data visualisation, changed the way we understand information. His bar graphs, pie charts, and line graphs remain essential tools today, yet his name is barely known.

Data Interpretation is an important part of the Quantitative Aptitude section in many competitive exams. It tests the ability ...

Guidelines: While most bar charts should be converted into accessible tables, this simple chart can be presented as text in a list. Provide the title and labels. It is not necessary to describe the ...

Presenting data in charts? Do not use 3D objects to show values, warns a data visualisation expert An excerpt from ‘Impactful Data Visualization: Hide and Seek with Graphs’ by Kavitha Ranganathan.