On Apr 10, 2009, at 4:53 PM, Judith Flores wrote:
Hello R-community,
I want to generate stacked density plots in lattice. My data
consist of a numeric variable ('pid') that is measured in different
individuals ('id'), which can be divided in two types ('type') and
the measurements were repeated a different time points ('day').
I read in the Lattice book that this can be done using the 'flowViz'
package, so I tried to reproduce the example given in there and
obtained an error:
library('flowViz')
data(GvHD, package='flowCore")
densityplot(Visit~'FSC-H'|Patient, data=GvHD)
Error: ' "FSC-H" ' is/are no valid parameter(s) in this frame
I am not sure if I am missing something.
You are missing the fact that back-quotes are not the same as single-
quotes. This should be successful:
densityplot(Visit~`FSC-H`|Patient, data=GvHD) # rather an attractive
graph
(You are also posting a question about a Bioconductor package to the
wrong list. )
I was hoping to apply something similar to my data, maybe like this?
desityplot(id~pid|type+day, data=mydata)
Thank you in advance for your help,
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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