Data Visualization IS 101Y/CMSC 101 Computational Thinking and Design Thursday, October 10, 2013 Marie desJardins University of Maryland, Baltimore County.

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Presentation transcript:

Data Visualization IS 101Y/CMSC 101 Computational Thinking and Design Thursday, October 10, 2013 Marie desJardins University of Maryland, Baltimore County

Midterm Preparation All assigned class material is fair game: Assigned readings from the three textbooks (St. Amant, Processing, MYM) Other assigned readings and videos as listed in the class schedule Lecture slides and in-class discussions The focus is on conceptual understanding rather than memorization of details Be able to define and answer questions about key concepts Not memorizing details of examples mentioned in passing Be able to write and interpret Processing programs Not picky/”trick question” syntax questions Format: About 25 questions Mix of true-false, multiple-choice, matching, and open-ended (short answer or write a program fragment) questions Closed-book but with limited notes: You may bring one page of notes (8.5”x11”, front and back, typewritten or handwritten, must be prepared by you but you can talk to other students as much as you want about what to include)

The purpose of computing is insight, not numbers. Richard Hamming

Numbers

What information consumes is rather obvious: it consumes the attention of its recipients. Hence a wealth of information creates a poverty of attention, and a need to allocate that attention efficiently among the overabundance of information sources that might consume it. Herb Simon

Lots of Numbers Simulations Sensors/scanners Surveys Equations Tracking and data gathering Data integration

A Medical Detective Story London, 1854: Cholera outbreak (500 deaths in 10 days) John Snow was a physician who investigated the outbreak; he suspected transmission through the water supply

Logic of Display and Analysis 1. Place data in appropriate context for assessing cause and effect Map vs list vs time series

Logic of Display and Analysis 2. Make qualitative comparisons (who escaped)

Logic of Display and Analysis 3. Consider alternative explanations and contrary cases

Logic of Display and Analysis 4. Assess possible errors in numbers reported Missing addresses Missing habit information

Aggregation Pitfalls Spatial Voronoi Diagrams

Aggregation Pitfalls Temporal

Technologies of Knowledge Discovery Machine learning Data mining Visualization Visual analytics

What is Visualization? Definition: visual representation of data Connotations: Computer-generated (mostly) LOTS of data Transforms the abstract and symbolic into the geometric Harnesses the human visual perception and cognitive systems

Text Representation

Visualization Tasks See values Extrema Anomalies Boundaries/thresholds Distribution/structure/pattern See multiple variables Relationships See flow/change Understand process

Student Retention

Student Retention cont.

Data Exploration: GapMinder Show time-varying visualization on Where’s the US? Point out some other countries Outliers: Richest country? Poorest? Longest-lived? Shortest-lived?