SP 225Lecture 6

Graphing

Pie Chart

A graph depicting qualitative data as slices of a pie

Example

Climate of the World’s Countries

Frequency Percentage

Desert 7 6.9%

Arid Desert 5 4.9%

Arid 6 5.8%

Tropical 32 31.4%

Mediterranean 10 9.8%

Maritime 4 3.9%

Temperate 34 33.3%

Arctic 4 3.9%

Total 102 100%

Bar Chart

A bar graph for qualitative data, with the bars arranged in order according to frequencies or natural order

Histograms

Example

  Frequency Percent

0-9 4 20

10-19 6 30

20-29 8 40

30-39 2 10

Frequency Polygon

Uses line segments connected to points directly above class midpoint values or class label

Choosing a Graph Type

Choosing a graph type Making graphs in SPSS

In Class What type of chart best displays the data for the

variable income and realrinc? Why? Use SPSS create a graph of each income

variable. Does each graph suggest income inequality

exists? Is either graph misleading? Why?

Write your responses on the SPSS graph output.