Data Visualization Laura Portell 1 Objective Data visualization is the practice of translating information into a visual context to make data easier for the human brain The main goal of data visualization is to make it easier to identify patterns trends and outliers in large data sets 2 What is Data Visualization http atenciociutadana gencat cat web content manuals visualitzacio dades guia visualitzacio eng pdf 3 Differents kinds of visualizations Mathematical visualization Mathematical visualization allows for reducing complexity when dealing with a multitude of information It is used data results from mathematics Mandelbrot set Complex analysis Geometry Graph theory https en wikipedia org wiki Mathematical visualization 4 Differents kinds of visualizations Scientific visualization of refers the Scientific visualization practice graphical representations of scientific phenomena as a means of gaining understanding and insight into the data producing to https www youtube com watch v 6Sz l6RDrvU 5 Differents kinds of visualizations Information visualization Information visualization refers to the use of computer supported interactive visual representations and non numerical abstract data sets in order to amplify human cognition numerical of for tool the visualization of A the information is a dashboard A dashboard graphically represents the data that is most important we can find different types of graphs 6 Modes of Visualization Presentation Visualization It is the type of visualizations that we use to communicate to a group of people in a conference a video slides etc 7 Modes of Visualization Interactive Visualization Interactive visualization focuses on graphic representations of data that improve the way we interact with information Most often these visualizations provide an easy way to understand insights that may be based on rapidly changing data Interactive visualization is used for discovery The main difference with presentation visualization is that it does admit user interaction 8 Information visualization 9 Information Visualization Information visualization is the process of representing data in a visual and meaningful way so that a user can better understand it We need descriptive data Descriptive statistics summarize and organize characteristics of a data set You can remember it in the presentation Statistics I 10 Information Visualization Examples A dashboard graphically represents the data that is most important we can find different types of graphs 11 Information Visualization Examples Spotify advertising campaigns 12 Information Visualization Examples Spotify advertising campaigns 13 Information Visualization Examples Google trends allows you to analyze how the popularity of searches is evolving https trends google com The applications that this has are many For example predicting flu outbreaks from people s Google searches 14 Creating a dashboard 15 Definition tool is a A dashboard that provides a centralized interactive means of monitoring measuring analyzing and extracting relevant information insights from different datasets in an interactive intuitive and visual way Dashboards aggregate data from multiple data sources 16 Dashboards versus Reports What s the difference The difference is about the shift in perspective from periodic reporting like quarterly or yearly to continued monitoring like daily or weekly What makes dashboards and reports so valuable is how you and your team use them to your advantage Dashboards are interactive reports no 17 Audience 18 Audience By audience we understand those who will use the data visualisation Designing good data visualisation is similar to designing an application and therefore knowing the knowledge and motivations of the user is vital to ensure its success To identify the audience it is useful to answer these questions Relationship Do we know them personally Do they know us Is the audience homogeneous or heterogeneous Information extracted from http atenciociutadana gencat cat web content manuals visualitzacio dades guia visualitzacio eng pdf 19 Audience Knowledge of the subject Do they recognise us as an authority on the subject What knowledge do they have of the subject What experience do they have in the use of data Context Which device or devices will you use to present the visualisation What goals do you have What effect do you expect it to have How long do they have to view the presentation What channels will we use to reach the audience Information extracted from http atenciociutadana gencat cat web content manuals visualitzacio dades guia visualitzacio eng pdf 20 Graphs 21 Graphs The most used elements in dashboards are graphs We can find different types of graphs Next we will look at a small selection of different chart types Definition The collection of all points whose coordinates satisfy a given relation 22 Bar Chart A bar chart is a type of graph that is used to show and compare different measures for different categories of data or data series This graphic consists of two axes a quantitative axis which shows the values represented and a text axis which indicates the category to which the data belong Each category is represented by a rectangle the scale of This chart type can either be in horizontal or in a vertical orientation https www displayr com what is a column chart 23 Bar Chart 2 When to use it When you want to compare a set of values and establish a ranking Because the human eye is very good at comparing the size of elements that are located on the same axis the bar graph not only shows the highest and lowest values but also helps to give a fairly accurate impression of the difference between some values and others Example of a bar chart ordered to facilitate appreciation of the ranking of the categories When the names of categories are long it is advisable to write them horizontally to make them easier to read 24 Bar Chart 3 When to use it If data correspond to time intervals vertical bars are preferable 25 Bar Chart 4 When to use it The quantitative axis must always start at zero because otherwise differences in values are magnified and mislead the reader 26 Clustered bar chart Clustered bar chart is a variations of the column chart TIP We normalize data to compare them or put values on two scales 27 Population Pyramid Bar Chart Population Pyramid Bar Chart is a bar chart used to compare multiple series together as it commonly used with population pyramids https madplumcreative com