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Questions and Answers
What is the primary purpose of data visualization?
What is the primary purpose of data visualization?
Which of the following is not a type of aesthetic in data visualization?
Which of the following is not a type of aesthetic in data visualization?
What does the term 'discrete data' refer to in data types?
What does the term 'discrete data' refer to in data types?
How are data values mapped onto aesthetics in visualizations?
How are data values mapped onto aesthetics in visualizations?
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Which type of data would 'temperature' in a dataset best be categorized as?
Which type of data would 'temperature' in a dataset best be categorized as?
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Which of the following is an example of qualitative/categorical data?
Which of the following is an example of qualitative/categorical data?
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In which scenario would you use discrete aesthetics in a data visualization?
In which scenario would you use discrete aesthetics in a data visualization?
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What role do scales play in data visualization?
What role do scales play in data visualization?
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What determines the location of different data values in a graphic?
What determines the location of different data values in a graphic?
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Which coordinate system is commonly used in most visualizations?
Which coordinate system is commonly used in most visualizations?
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What is a qualitative color scale primarily used for?
What is a qualitative color scale primarily used for?
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Which of the following scenarios is best suited for a sequential color scale?
Which of the following scenarios is best suited for a sequential color scale?
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What is one of the three fundamental use cases for color in data visualizations?
What is one of the three fundamental use cases for color in data visualizations?
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What is the primary purpose of accent colors in data visualization?
What is the primary purpose of accent colors in data visualization?
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How does a sequential color scale communicate the relationship between values?
How does a sequential color scale communicate the relationship between values?
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Which condition must a qualitative color scale meet when choosing colors?
Which condition must a qualitative color scale meet when choosing colors?
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Study Notes
STAT 288: Data Visualization
- Course taught by Dr. Abdulla Eid
- Covers chapters 2, 3, and 4
Chapter 2: Data Visualization: Mapping Data Onto Aesthetics
- Visualizing data involves systematically mapping data values to visual elements
- Data visualizations (e.g., pie charts, bar charts, histograms) map data values into quantifiable features
- These features are called aesthetics
Aesthetics and Types of Data
- Aesthetics: components of a graphic used to represent data (position, shape, size, color, line width, line type)
- Continuous data: values that can take on any value within a range (e.g., temperature)
- Discrete data: values that can only take on specific, distinct values (e.g., number of cylinders in a car)
Aesthetics
- Continuous aesthetics: used to represent continuous data
- Discrete aesthetics: used to represent discrete data
Data Types
- Quantitative/Numerical Continuous
- Quantitative/Numerical Discrete
- Qualitative/Categorical Unordered
- Qualitative/Categorical Ordered
- Date or Time
- Text
Example of Data Type
- Table showing daily temperature averages for 4 locations (Chicago, San Diego, Houston, Death Valley) over 30 years
- Variables: month, day, location, station ID, temperature (degrees Fahrenheit)
2.2 Scales Mapping Data Values onto Aesthetics
- Scales map data values to aesthetics.
- Example: mapping data to x-axis, shapes, or colours
Example: Map Data to Aesthetics
- Graph showing temperature trends for each location over a year (Jan-Jan)
Another Mapping
- Heatmap visualizing monthly temperatures for each location
How Many Scales We Are Using?
- Different scales used to represent various data points
Chapter 3: Coordinate Systems and Axes
- Position Scale: determines locations of data values on a graphic
- Coordinate systems: combination of position scales
3.1 Cartesian Coordinates
- Basic coordinate system (x and y axes)
- Points are plotted using (x, y) coordinates
What can you say about these visualizations? (a,b,c)
- Simple line graphs show temperature variation across months for different cities
3.2 Non-Linear Scale
- Using scales to represent data values
3.3 Coordinate Systems with Curved Axes
- Alternative coordinate systems (polar coordinates, maps)
Example of Curves Coordinate System
- Example using a radial, circular scale to represent data over time (temperature variation over time
Chapter 4: Color Scales
- Fundamental uses of color in visualizations:
- Distinguishing data groups
- Representing data values
- Highlighting data points
4.1 Color as a tool to distinguish
- Using color to differentiate items in a visualization (e.g., geographical locations based on population growth)
Qualitative Color Scale
- Using qualitative color scales to represent distinct categories
4.2 Color to represent data values
- Using color to show variation in data (e.g., income across a region)
Sequential Color
- Sequencing colors to represent ranges (e.g., low to high) in values of data (e.g., temperature or income)
4.3 Color as a tool to highlight
- Highlighting key areas in a data visualization
Accent Colors
- Using accent colors to emphasise key specific categories or specific data values.
Different Systems (Subject specific)
Maps using various projections (Cartesian, interrupted Goode homolosine, Robinson, Winkel tripel)
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Description
Explore the principles of data visualization in Chapter 2 of STAT 288. This chapter discusses how to map data values to visual elements such as position, shape, and color. Learn about the difference between continuous and discrete data aesthetics.
