Melanie Edwards wrote:
> I am curious whether anybody has or is developing this capability within
> R. I have not found any software yet that has this capability and I am
> not sure whether it is too new a method and nobody is actually using it,
googling around I found that this (PVA) is a variant of factor analysis
restricted to find non-negative factors. It is not a new method,
although maybe the name is. This has been/is used for instance in
air quality monitoring to identify sources of pollution, and if you have
some prior information about possible sources that maybe could be used
to. I guess this could be called 'source unmixing' or something similar,
which indicatyes a similarity with independent component analysis. Maybe
enough to restrict optimization to non-negative values?
help.search("factor analysis") shows that factor analysis is multiply
implemented for R, so maybe there is something, and if not, maybe
simple to adapt.
Kjetil Halvorsen
> or if there are other means to get the same analysis that I do not know
> of. Any information regarding developments or use of this method would
> be helpful.
>
> Melanie Edwards
>
>
>
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>
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