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October 28, 2017

In data science, one of the challenges we try to address consists on fitting models to data. The objective is to determine the optimum parameters that can best describe the data.  For example, if we have the following linear model:

we want to determine the optimum β's w...

June 17, 2017

One of the cool things you can do with Tableau is define every pixel from an image. This allows you to create interesting visualizations as described below.

Before we get started, let’s first understand some fundamental concepts about digital images.

DIGITAL IMAGE

A digit...

March 29, 2017

A common mistake I often observe in data analysis is the averaging of percentages.  To explain this concept let’s examine a simple example.

Suppose we conduct a survey on whether people like or do not like chocolate.  We discover that 90% of children like chocolate; how...

February 21, 2017

This is part 2 of a post where we demonstrate how to plot functions in Tableau.  Part 1 can be seen here.

In this section we are focused on using Polar coordinates.  This is a helpful system for recreating shapes that have some sort of circular shape.  In Cartesian coor...

February 17, 2017

In this post, we will demonstrate a method for plotting two-dimensional functions in Tableau.  We will present examples in both Cartesian and Polar coordinates. This post focuses on the Cartesian system and the follow-up post focuses on the Polar Coordin...

February 3, 2017

A typical map is a two-dimensional representation of a three-dimensional sphere.  When we draw paths, we know that the shortest distance between two points is a straight line.  Nevertheless, the shortest path on the surface of a sphere does not necessarily look like a...

January 26, 2017

Artists are capable of drawing images that are perceived as three-dimensional (3D) on a two-dimensional (2D) canvas, such as a piece of paper; therefore, giving the illusion that an object is jumping out of the page.  In this project we demonstrate a technique in which...

January 14, 2017

I recently got inspired from viewing a dashboard designed by Adam Crahen, where he created a Circular Radial Chart based on data about Gender Disparity in Australia *.  Doing some research I came up with a few posts that explain how to create these types of charts, suc...

December 6, 2016

In the US, the electoral college drives the presidential election. A candidate will win an election if they obtain more than half of the electoral votes (EV), regardless of the popular vote. For the fifth time in the history of this country, the candidate who won the p...

November 22, 2016

What if we could only draw straight lines on a canvas? Could we be able to create art under such a constraint?

A few weeks ago, I came across a very talented artist, Petros Vrellis, who created interesting art pieces by only using straight lines. Several others have tri...

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