Hi all,

I was wondering if anyone knew how to construct a multiple line graph on R, 
where there  are 2 (or more) sets of data points plotted against some x axis of
data, and you can draw a line on the graph connecting each set of data points.
for example:
  time..years.          incidence        rural   urban
1         2004          295.4           19.01    9.50
2         2005          824.1           19.95    9.98
3         2006          1078.0           20.70  10.35
4         2007          1258.0                   21.26  10.63
5         2008          1800.0           21.83   10.91
6         2009                   1890.0          18.93    9.47
7         2010                   1999.0                   19.41   9.71
8         2011             2261.0        19.89    9.95
9         2012             2321.0                  20.28          10.14

Idea:
a) I am planning plot a graph of data illustrated above where on Y-axis we can 
have data in sets INCIDENCE, RURAL and URBAN and on X-axis the points in set 
TIME..YEARS.
b) Would like to be able to draw three lines ,connecting the points for each 
set of INCIDENCE, RURAL and URBAN over TIME..YEARS.

I have tried really hard to find something but wasn't successful, the latest 
information I received after doing the command shown underneath was:

> plot(data1$time..years.,data1$incidence,main="Plot illustrating diarrhoeal 
> incidence over time", xlab="Time(years)",ylab="Diarrhoeal 
> incidence",ylim=range(data[c("incidence","rural","urban")]),type"l", col=2)
Error: unexpected string constant in 
"plot(data1$time..years.,data1$incidence,main="Plot illustrating diarrhoeal 
incidence over time", xlab="Time(years)",ylab="Diarrhoeal 
incidence",ylim=range(data[c("incidence","rural","urban")])"

Many thanks,
W
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