ggplot2

Question 1

aesthetics

Answer 1

Attributes including horizontal and vertical position, size, color and shape

Question 2

scaling

Answer 2

Conversion from data units(eg. liters, miles per gallon) to physical units (e.g. pixels and colors)

Question 3

coord

Answer 3

e.g. Cartesian coordinates, spherical projection, polar coordinates etc.

Question 4

plot annotations

Answer 4

e.g. background and plot title

Question 5

Three sources to create a complete plot

Answer 5

1. Data, represented by the point geom 2. Scales and coordinate system 3. Plot annotation

Question 6

scales and coordinate system

Answer 6

generate axes and legends so that we can read values from the graph

Question 7

Scale transformation

Answer 7

1. Occurs before statistical transformation so statistics are computed