Past Meetup

Data Visualization - Hands on Lab

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In this lab we will explore how to visualize data related to Item Response Theory (IRT). The format for the meeting will be the following


7:00-7:15 arrival

7:15-7:45 Data Visualization - Hjalmar Gislason

7:45-8:00 (TBD Industry Practitioner or Lab Prep)

8:00-8:50 Lab

8:50-9:00 Announcements & Informal Chat

Lab Details:


1. Optionally Install RStudio ( )

2. Required download template html file for exercise

3. Optionally download intermediate steps of lab

Theory: Item Response Theory

Technology: RStudio & D3

Data Set: LSAT Question Data from ltm package from R

0. Overview of Item Response Theory

1. Generate Response Matrix in RStudio

2. Use Response Matrix to populate a html table with D3

3. Modify Content of table based on response matrix content

HTML files can be found on the site

Guest Speaker:

Hjalmar Gislason - Founder and CEO of

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