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To provide the most recent news and documentation www.pymvpa.org reflects the
development 2.0 series (renamed 0.6 series) of PyMVPA. If you are interested in the
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visit v04.pymvpa.org.
Ratio between RMSE and root mean power of target output.
So it can be considered as a scaled RMSE – perfect reconstruction
has values near 0, while no reconstruction has values around 1.0.
Word of caution – it is not commutative, ie exchange of predicted
and target might lead to completely different answers
