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I am working on some microarray data where the samples come from
patients with different severities of disease state - something like
"mild", "moderate", "severe".
I suppose this is an 'ordinal' variable, but only know how to input
categorical and continuous variables into the model and searching the
Limma manual for the word 'ordinal' doesn't get me anywhere.
Is it possible to work ordinal variables into my model? If not and I
still want to use Limma is it best to treat it as categorical or
continuous? Or is there an alternative package I could use which has
this functionality?
Many thanks in advance,
Scott
-- output of sessionInfo():
> sessionInfo()
R version 3.0.1 (2013-05-16)
Platform: x86_64-w64-mingw32/x64 (64-bit)
locale:
[1] LC_COLLATE=English_United Kingdom.1252
[2] LC_CTYPE=English_United Kingdom.1252
[3] LC_MONETARY=English_United Kingdom.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United Kingdom.1252
attached base packages:
[1] parallel stats graphics grDevices utils datasets
methods
[8] base
other attached packages:
[1] limma_3.16.7 sparcl_1.0.3 lattice_0.20-23
[4] corrplot_0.71 affyPLM_1.36.0 preprocessCore_1.22.0
[7] simpleaffy_2.36.1 gcrma_2.32.0 genefilter_1.42.0
[10] affy_1.38.1 Biobase_2.20.1 BiocGenerics_0.6.0
loaded via a namespace (and not attached):
[1] affyio_1.28.0 annotate_1.38.0 AnnotationDbi_1.22.6
[4] BiocInstaller_1.10.3 Biostrings_2.28.0 DBI_0.2-7
[7] grid_3.0.1 IRanges_1.18.3 RSQLite_0.11.4
[10] splines_3.0.1 stats4_3.0.1 survival_2.37-4
[13] XML_3.98-1.1 xtable_1.7-1 zlibbioc_1.6.0
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