[BioC] Expression values of a gene
srini_iyyer_bio at yahoo.com
Wed Feb 9 01:06:32 CET 2005
I have a couple of questions.
I have 250 CEL files from various experimental
sources. My aim is to extract gene expression values
(and not the fold changes) for every gene on
I obtained the gene expression values in the following
Is it true that I have expression values for all the
probesets in my_expr_values?
Or did I miss any crucial step here.
For many genes affymetrix assigned 2 or more
For egfr gene there are 4 probe_sets.
Now that I want expression values for 'single gene',
what do I have to do to assign an expression value to
a single gene. Does the program averages the
experssion values for 4 probe_sets and assigns a
single expression value to EGFR gene?
How can I obtain genes on chromosome 17.
my_chr_list <- as.list(hgu133aCHR)
my_gene_name <- as.list(hgu133SYMBOL)
How can I associate the gene_name to the probe_set
(with Expression values) and chromosome number.
Can any one please help me. Thank you. Srini
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