R help - Mar 2005 - Line plot using xyplot function in lattice package

Hi All,

For the following data when I use xyplot in package lattice the intervals are in
the order of 2, 24, 8, but instead I want them to be in the order 2, 8, 24.

  Treatment Interval  value
  A          2  		0.448
  A	       24		1.85
  A          8  		1.166
  B          2  		1.074
  B	       24		1.5
  B          8  		1.065
  C  	       2  		0.854
  C          8  		0.589

The R script is xyplot(value ~ Interval, data=studyData, type='b',
groups = Treatment,

Is there a way in xyplot to specify the order?. 

-Sandeep

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Ghosh, Sandeep wrote on 3/17/2005 1:25 PM:
> Hi All,
> 
> For the following data when I use xyplot in package lattice the intervals
are in the order of 2, 24, 8, but instead I want them to be in the order 2, 8,
24.
> 
>   Treatment Interval  value
>   A          2  		0.448
>   A	       24		1.85
>   A          8  		1.166
>   B          2  		1.074
>   B	       24		1.5
>   B          8  		1.065
>   C  	       2  		0.854
>   C          8  		0.589
> 
> The R script is xyplot(value ~ Interval, data=studyData, type='b',
groups = Treatment,
> 
> Is there a way in xyplot to specify the order?. 
> 
> -Sandeep

Hi Sandeep,

You can make Interval an ordered variable:

studyData$Interval <- ordered(studyData$Interval, c("2",
"24", "8"))
xyplot(value ~ Interval, data=studyData, type='b', groups = Treatment)

--sundar