Dear all,

We  want to combine two datasets, one coming from Human U133a arrays,
and the other coming from PLUS2 arrays.
Initially we attempted with combineAffybatch package, and apart that we
had serious problems with the mas5 obtaining of expression
values from the combined object, we  read recently at this list that a
best scheme is to normalize studies separately and put them
together with some tool as MergeMaid. WeI did not find a clear way to
proceed with this package on the web, and, at this moment we
do not want to change the version of R used at the lab, that is 2.3.1.
When we downloaded the current MergeMaid version we had this
message:

----
> library(MergeMaid)
Loading required package: survival
Loading required package: splines
Loading required package: Biobase
Loading required package: tools

Welcome to Bioconductor 


    Vignettes contain introductory material.

    To view, simply type 'openVignette()' or start with 'help(Biobase)'.


    For details on reading vignettes, see the openVignette help page.


Loading required package: MASS
Error in lazyLoadDBfetch(key, datafile, compressed, envhook) : 
        ReadItem: unknown type 25
In addition: Warning message:
package 'MergeMaid' was built under R version 2.4.0 
Error in get(mname, where) : recursive default argument reference
----

could we download another version of the package in order to continue
working with R.2.3.1? And perhaps the authors could
give us a more detailed scheme of the process to follow for the merging?

Thanking you in advance,

Susana



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