On Oct 3, 2013, at 16:30 , Hermann Norpois wrote:
> Thanks for answering.
>
> I already started hunting. But my first doubt was if I used prcomp correctly
> (and this is in the moment my most important point). So far as I understood
> your answer is yes. Is that correct?
Yes. There are a cou
Thanks for answering.
I already started hunting. But my first doubt was if I used prcomp
correctly (and this is in the moment my most important point). So far as I
understood your answer is yes. Is that correct?
I am puzzled by the fact that these "columns" are more or less in the
middle of my sn
It's not so obvious to me that this is an artifact. What prcomp() says is that
some of the eigenvectors have a lot of "activity" in some relatively narrow
ranges of SNPs (on the same chromosome, perhaps?). If something artificial is
going on, I could imagine effects not so much of centering colu
Hello,
I did a pca with over 20 snps for 340 observations (ids). If I plot the
eigenvectors (called rotation in prcomp) 2,3 and 4 (e.g. plot
(rotation[,2]) I see a strange "column" in my data (see attachment). I
suggest it is an artefact (but of what?).
Suggestion:
I used prcomp this way: prc
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