Chapter 16

Page 1

inferential statistics provide a range of support for decision making

statistical significance helps you to decide whether differences you see in averages between two or more groups is real or not

Data visualization:

Numerical data

Index number

Index data

Color coding

Interactive data charts

Make data easy to interpret

See patterns and connections

Anscome’s Quartet (70’s)

Descriptive sets won’t always tell the whole story

Graph data instead of simply summarizing

3 key activities:

data collection

data transforming/processing

data analysis/exploration

EDA: exploratory data analysis

------ Understanding visual encodings

Decomposing Visualizations:

What are the variables?

What are the visual encodings for each variable?

To what extent are the encodings effective?

Data types and visual encoding

Quantitative Data

-Discrete

-Continuous

2. Categorical Data

-Ordinal

-Nominal

formats of visual encoding

size

color

texture

saturation

length

shapes

position - most accurate

Choosing the correct chart