On Wed, Jan 12, 2011 at 4:38 PM, viritha kaza <viritha.k@gmail.com> wrote:

> Hi Group,
> Is there any function which would help in converting data from probe level
> to gene level by averaging the expression of all the probes corresponding
> to
> a gene.
> For eg:
>                         array1      array2
> probe 1 Gene 1    2                 4
> probe 2 Gene 1    4                 3
> probe 3 Gene 2    5                 4
>
> result:
>            array1 array2
> Gene1    3           3.5
> Gene 2   5           4
> Could any one give some ideas to perform this?
>

Hi, Viritha.  You might look at the aggregate function.  Also, you might
want to look at the genefilter package vignette which has some tools for
doing filtering, including finding representative probes for a given gene.

Sean

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