[R] re-ordering bwplot

[Steven McKinney]

Here's one way - you can reorder the levels of a factor variable by specifying
the levels the way you want them.  

> require("lattice")
Loading required package: lattice
> bwplot( conc ~ Type : Treatment, data = CO2 )
> str(CO2$Type)
 Factor w/ 2 levels "Quebec","Mississippi": 1 1 1 1 1 1 1 1 1 1 ...
> 
> str(CO2$Treatment)
 Factor w/ 2 levels "nonchilled","chilled": 1 1 1 1 1 1 1 1 1 1 ...
> ?bwplot
> CO2 <- CO2  ## Make a copy in the global environment
> CO2$Type2 <- factor(as.character(CO2$Type), levels = c("Mississippi", "Quebec"))
> with(CO2, table(Type, Type2))
             Type2
Type          Mississippi Quebec
  Quebec                0     42
  Mississippi          42      0
> quartz() ## Your plot window type here (quartz() works on a Mac)
> bwplot( conc ~ Type : Treatment, data = CO2 )
> quartz()
> bwplot( conc ~ Type2 : Treatment, data = CO2 )
> 

Steven McKinney

Statistician
Molecular Oncology and Breast Cancer Program
British Columbia Cancer Research Centre


________________________________________
From: r-help-bounces at r-project.org [r-help-bounces at r-project.org] On Behalf Of Eck, Bradley J [brad.eck at mail.utexas.edu]
Sent: July 23, 2010 10:02 AM
To: r-help at r-project.org
Subject: [R] re-ordering bwplot

Dear list:

I'm using bwplot to compare concentrations by location and treatment as in:

# using built in data
bwplot( conc ~ Type : Treatment, data = CO2 )

I would like the order of the plots to be: 3,4,1,2.   I can't seem to figure this out with index.cond or permc.cond.

Any help is appreciated!

Brad Eck


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