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Comments on Raptor's Nest: Principal coordinate analysis and the quest for a solution to a non-existent problem





Updated: 2017-09-25T21:58:15.874+01:00

 



I'm also having a problem very close to this o...

2013-01-11T13:08:40.292+00:00

I'm also having a problem very close to this one, with the exception that i'm actually getting a non-euclidean distance matrix out of UniFrac (strictly speaking, NOT a positive semi-definite matrix). And i'm also wondering what the hell to do with those negative eigenvalues. Does anyone know what they ultimately mean?



Holy crap! I found this blog post with the EXACT ...

2011-01-31T00:22:57.537+00:00

Holy crap! I found this blog post with the EXACT same problem in R. You just saved me some time.



Hi Sudharsan, I've found it difficult to find...

2010-04-07T09:07:54.347+01:00

Hi Sudharsan,

I've found it difficult to find a single good reference on principal coordinates and principal components analyses, so I had to read multiple sources, namely multivariate statistics text books. But there is a pretty good essay by Norman MacLeod (Natural History Museum, London) that explains in relatively simple terms PCA and other related methods:

http://www.palass.org/modules.php?name=palaeo_math&page=3

The great thing about this essay series is that it starts with correlations and regressions and extends the line of thought to PCA.



I'm newbie for principal coordinate analysis. ...

2010-04-07T05:15:43.694+01:00

I'm newbie for principal coordinate analysis. Infact my current assign ment ot o write about principal coordinate analysis and principal component analysis.... but the problem is that i dun get enough simple reference to get an idea about these principals....can u please any useful explanation? thank you.



I never make these sort of mistaks es...

2009-05-13T17:59:00.000+01:00

I never make these sort of mistaks
es...