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Module 6: Line Graphs
This module provides information on arithmetic scale and semi-logarithmic or ratio scale line graphs.
Reviewed 15 April 05 /MODULE 6
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Secular Trends in never smoking among adolescent boys and girls aged 12 through 17 years: California, 1990-1999
55
60
65
70
75
1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000
Year
Pe
rce
nta
ge
Ne
ve
r S
mo
ke
rs
Female
Male
Arithmetic Scale Line Graph
Source: Am J Public Health, Dec.2003; 93:2101
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• Use: Show amount of change or difference in the dependent variable (vertical axis) for the different points of the independent variable (horizontal axis).
• For: Interval or ratio data.
Arithmetic Scale Line Graph
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Arithmetic Scale Line Graph
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Source: Am J Public Health, Dec. 2003;93:2089
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Source: Am J Public Health, Aug. 2000;90:1399
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Source: Am J Public Health, July 2001;91:1061
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Source: Am J Public Health, July 2000;90:1067
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• Use: Show rate of change in the dependent variable (vertical axis) for the different points of the independent variable (horizontal axis).
• For: Interval or ratio data.
Semi-logarithmic or Ratio Scale Line Graph
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Semi-logarithmic or Ratio Scale Line Graph
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0
20
40
60
80
100
120
1 2 3 4
Year
Ari
thm
eti
c S
cale
ABC
Arithmetic and Semi-log Scale Line Graphs
1
10
100
1 2 3 4
Year
Sem
i-Lo
g S
cale
ABC
Year A B C
1 10 60 12
2 20 70 24
3 30 80 48
4 40 90 96
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Semi-logarithmic Scale
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Ratio Scale
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Source: Am J Public Health, Mar. 2004;94:456
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Source: Am J Public Health, Mar. 1996;86:560
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A Line Graph and a Bar Chart with a Scale break