David Velleca

Updated by David Velleca on September 1, 2021

The Rock, Paper, Scissors, Lizard, Spock Simulator...

A Big Bang Theory Inspired Interactive Game

Last week, I published my Friends Random Episode Selector and shared to LinkedIn. One of the comments was a request to do the same thing for The Big Bang Theory. I looked for data and I didn't find anything that supported an interactive random selector like my Friends version did. So, instead, I decided to play some Rock, Paper, Scissors, Lizard, Spock...with Tableau...MORE

The One Where They Can't Decide What to Watch...

A Friends Random Episode Selector

It has been quite awhile since I've had the time to spend on a personal Tableau project, but the other night my wife and I (somehow) "ran out of things to watch" on TV. We ended up watching an episode of Friends, but still then had to choose which of the 236 episodes of American Sitcom Gold to watch. I knew right then that I had my next Tableau project - a "random" episode generator... MORE

2020 In Review - My Top Moments

Reflecting on the Moments that Shaped my Year

It's no surprise that 2020 was a difficult year for all, but even through all of the trials, there were likely some bright spots for everyone. Looking forward to 2021 and the next challenges that lie ahead, I wanted to take the opportunity to look back on 10 impactful moments in 2020. I challenge you to do the same, tag 5 connections and let 2020 go out on a high(ish) note. After all, some of our best growth and learning comes from persevering in the face of adversity. MORE

#STLTUG Viz Brew

A St. Louis Tableau User Group Data Viz Competition

The St. Louis Tableau User Group Co-Leads are happy to announce that we're hosting the first ever STLTUG Viz Games! Viz Games are your opportunity to compete with other Data Viz professionals in the St. Louis Area, putting your skills to the test, and pushing yourself to learn. Think of it as our version of Iron Viz... MORE

Choose Your Own Adventure - Tableau eLearning Style...

How do you Role?

Tableau is currently offering 90 days of FREE eLearning. I'm hoping the following provides a bit of info about the Tableau eLearning offering, as well as a tool to help you navigate through the curriculum. How will you drive your personal development across the next 90 days??? MORE

Missouri COVID-19 Tracker

Trying to Keep Data Viz Uncomplicated and Responsible...

When it comes to data visualization, we’ve seen several trends over the past year – first there were visual resumes, then bar chart races, but most recently visualizations have been dominated by COVID-19 data. Some of these visualizations have been very good, while others have been a bit misleading. The prevalence of COVID-19 visualizations means that individuals who do not necessarily interact with data or visualizations on a regular basis are being flooded with graphs and charts. When the visualizations are clear and representative of the data, this is a good thing; when they fail to use best practices, they can be misleading or even fear or panic inducing...MORE

#TShirtADay - A New Data Viz Project

(And a way to help entertain me during social distancing)

Yesterday, I started working from home for the foreseeable future. This means a few things... First, I'll be hiding out in the basement, trying to avoid the distractions that can come with home. Second, I don't *have to* wear my typical button up shirt or polo during this time. I know there's experts out there that suggest that you still make the effort to get dressed up even when working from home. Maybe they don't have as many t-shirts as I do...MORE

Certifiably Altered

How Certification (and Learning) can be a Game Changer for You, Your Career and Your Team

Tuesday night, I spoke at the St. Louis Alteryx User Group about a learning program that I etablished within my team. The program culminated around challenging each team member to earn their Alteryx Designer Core Certification...MORE

Taking a different approach to #ThrowbackDataThursday

Why and How I did it...

For this month’s #ThrowbackDataThursday, I wanted to make sure that I took some of what I saw, learned and/or was inspired by during Tableau Conference, and incorporate that into my viz...MORE

Creating a 3D Globe in Tableau

A How To

When I was creating this month's ThrowbackDataThursday data challenge, I brought the data into Tableau and created a really quick map. With the map background washed out and all layers removed, the data created a really interesting view of the UFO Sighting data...MORE

#Set Actions: Drilling

Get to the Data that's Most Important

A couple weeks ago, I tweeted a Tableau Confession: At first, I didn't get all the hype about set actions. BUT, now I do and I'm finding loads of good uses for set actions. Come find out how I used set actions to drill into NFL Draft Data...MORE

#SportsVizSunday - MLB

Spring Training vs Regular/Postseason Performance

Typically for me, this time of year is a lot of fun from a sports point of view. Formula 1 started the season this past weekend, March Madness tips off tonight, we're getting close to playoff hockey, and baseball is almost back!...MORE

Easily View Calculation Logic - ON A MAC!!!

A Quick Tip...

When I posted back in January about using a custom language in Notepad++, I was immediately flooded with "What about Mac" questions. Well, I didn't have a Mac at that point, so wasn't hugely incented to figure it out. Since then, I've purchased a Mac, and now have a need. However, I didn't have the time. Step in fellow Tableau and Mac user Sean Miller...MORE

Using Notepad++ to Easily View Calculation Logic

A Quick Tip...

After Tableau Desktop the next most commonly used application on my computer is probably Notepad++. I use Notepad++ to take notes, edit HTML and XML files and to have a larger screen to review the logic from Tableau Calculated fields. I often get asked to help figure out why a calculated field is not producing the desired result. Sometimes, it's not feasible to review multi-line logic in Tableau, so I leverage Notepad++ for a larger window and some additional help...MORE

Fixing Aspect Ratios on Worksheets & Dashboards

A Quick Tip...

Disregarding the difficulty in visualizing a spherical representation or Earth on a flat screen, when we look at a map of the United States (or any map), the projection looks 'correct' to us because of the aspect ratio. The same goes for some types of data visualizations. If you struggle with manipulating axes and worksheet sizes when creating a dashboard, I've got a quick tip for you...MORE

Why Tableau Public?

Beyond the tool...

On Thursday of this week, I published my 100th (visible) Tableau Public visualization. Over the course of creating these vizzes, I’m sure I’ve invested well over 300 hours of effort. That leads to the question of why...MORE

In 2018, I did it in (Tableau) Public

2018 Goals in Review

In 2018, I made a concerted focus on pushing myself to be more active in the Tableau Community. In all honesty, this ‘resolution’ was a holdover from attending my first Tableau Conference in October 2017. I set some very modest goals, and am pretty pleased with the results...MORE

You're My 'Vizspiration'

Finding Inspiration from the Tableau Community

I've had several people ask me where I get the inspiration for the vizzes that I publish to Tableau Public. The answer is easy, as well as complicated. Each viz that I create is a sum of many parts - distilled down to the basic three, there are the dataset, the data story and most obviously the visual. While all interconnected, I draw from different sources for the inspiration for these three pieces. This is the first of a series of three posts delving into where I find my inspiration - let's dive into the People of Tableau, or where I get my 'vizspiration' for my visuals....MORE

Investing in my Future

From Spending my Time to Investing it

Over the past few weeks, I’ve had multiple ancillary conversations with friends about time and how we use it. The first was on a walk from my hotel to the convention center during Tableau Conference. A friend and I were discussing the new Screen Time feature in iOS 12.0 that tracks and conveniently displays how much time the user has spent on his or her iPhone. He mentioned that the results and insights were both shocking and slightly depressing at the same time. Fortunately, he’d used that data to make some changes in his life, and was happy with the results to date. After making a mental note that I probably needed to review my usage too, I filed the conversation away...MORE

The Viz that Almost Wasn't

From Unpublished to Viz of the Day

On Friday, November 2, I received a notification on my phone that I’d been tagged in a tweet by Tableau Public. I tapped on the alert and was super excited to see that my viz looking at the most common last names in the United States had been selected as the Viz of the Day. In addition to my excitement, I also had a bit of a “Wow, I can’t believe they chose that" moment...MORE

Getting Started

Starting My Personal Blog

I've been home from TC18 just over a week, and came back full of energy and enthusiasm to continue building my online Tableau presence. This is similar to how I felt after attending my first conference in 2017, but now I’ve got a base to build upon. In 2017, I returned home excited about the Tableau Community and how open and helpful the community is. With that in mind, I set out with the goal to become a part of that community...MORE