[GRASS-stats] Re: [GRASS-user] Testing i.pca ~ prcomp(), m.eigensystem ~ princomp()

Nikos Alexandris nikos.alexandris at felis.uni-freiburg.de
Tue Mar 31 11:16:06 EDT 2009

> With Markus' help I got access, and corrected/extended quite a few things,
> including why R sometimes doesn't print loadings (when they're close to
> 0).


> I do worry about the wiki that states results are "similar" between R and
> grass, when the differences appear e.g. in the third or second digit of a
> loading (eigenvector value). Clearly something is is going on, here.

So you think it's really important? Isn't it a matter of pixel-inclusion
in the various algorithms/programs?


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