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Matthew Schroyer

Matthew Schroyer
Matthew Schroyer is a Front End Developer for Exaptive, working on creating high-quality components and data applications for the Exaptive platform. Matt has a background in data journalism, in particular drone-based journalism. He founded the Professional Society of Drone Journalists. And he has spoken at SXSW, IEEE ISTAS, NSF LNC, and NARST, and for numerous media outlets about around the globe about drone journalism and citizen data science.
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Recent Posts

Exploring Tech Stocks: A Data Application Versus Data Visualization

A crucial aspect that sets a data application apart from an ordinary visualization is interactivity. In an application, visualizations can interact with each other. For example, clicking on a point in a scatterplot may send corresponding data to a table. In an application, visualizations are also enhanced with simple filtering tools, e.g. selections in a list can update results shown a heat map. 

You can already try some linked visualizations to find the perfect taco. Now, we'll look at how some simple filtering elements enhance visualization, using a tech stock exploration xap I built over a couple of days. (A xap is what we call a data application built with the Exaptive Studio.) A few simple, but flexible interactive elements can help transform ordinary visualizations into powerful, insightful data applications. Humble check boxes and lists help produce extra value from charts and plots.

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A Data Exploration Journey with Cars and Parallel Coordinates

Parallel coordinates is one way to visually compare many variables at once and to see the correlations between them. Each variable is given a vertical axis, and the axes are placed parallel to each other. A line representing a particular sample is drawn between the axes, indicating how the sample compares across the variables.

Previously, I wrote how it's possible to create a basic network diagram application from just three components in the Exaptive Studio. Many users will require more scalable from a data application, and fortunately the Studio allows for the creation of something like our Parallel Coordinates Explorer. Often times, a parallel coordinates diagram can also become cluttered, but fortunately, our Parallel Coordinates component lets users rearrange axes and highlight samples in the data to filter the view.

It helps to use some real data to illustrate. One dataset that many R aficionados may be familiar with is the mtcars dataset. It's a list of 32 different cars, or samples, with 11 variables for each car. The list is derived from a 1974 issue of Motor Trend magazine, which compared a number of stats across cars of the era, including the number of cylinders in the engine, displacement (the size of the engine, in cubic inches), economy (in miles per gallon of fuel), and power output.

Let's say we're interested in fuel economy, and want to find out characteristics could signify a car with good fuel economy. Anecdotally, you may have heard that larger engines generate more power, but that smaller engines generate better fuel economy. You may also have heard that four-cylinder engines are typically smaller in size than larger engines. Does this hold true for Motor Trend's mtcars data?

To find out we'll use a xap (what we call a data application made with Exaptive) that lets a user upload either a csv or Excel file and generates a parallel coordinates visualization from the data. But a data application is more than a data visualization. We're going to make a data application that selects and filters the data for rich exploration. 

In our dataflow programming environment, we use a few components to ingest the data and send a duffle of data to the visualization. Then a hand-full of helper components come together make the an application with which an end-user can explore the data.

Here's the dataflow diagram, with annotations. 

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Use a Network Diagram to Uncover Relationships in Your Data

Often times, when we're looking at a mass of data, we're trying to get a sense for relationships within that data. Who is the leader in this social group? What is a common thread between different groups of people? Such relationships can be represented hundreds of ways graphically, but few are as powerful as the classic network diagram.

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Finding Netflix's Hidden Trove of Original Content with a Basic Network Diagram

Nexflix has collected an impressive amount of data on Hollywood entertainment, made possible by tracking the viewing habits of its more-than 90 million members. In 2013, Netflix took an educated guess based on that data to stream its own original series, risking its reputation and finances in the process. When people were subscribing to Netflix to watch a trove of television series and movies created by well-established networks and studios, why create original content? Now, few would question the move.

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