[R-sig-eco] R-sig-ecology Digest, Vol 132, Issue 1

[Peter Nelson]

It sounds to me as though using PERMANOVA may be preferable. See, for example, https://doi.org/10.1002/9781118445112.stat07841 <https://doi.org/10.1002/9781118445112.stat07841>. The R package, vegan, can implement this technique. R: Permutational Multivariate Analysis of Variance Using Distance ...cc.oulu.fi/~jarioksa/softhelp/vegan/html/adonis.html <https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=2ahUKEwjSrbrKw_DgAhWFtZ4KHd8xBuMQFjAAegQIChAB&url=http%3A%2F%2Fcc.oulu.fi%2F~jarioksa%2Fsofthelp%2Fvegan%2Fhtml%2Fadonis.html&usg=AOvVaw1iRL1qmIXZ3jRobbXfkvyk>


Peter Nelson, PhD
Institute of Marine Sciences
University of California, Santa Cruz
Center for Ocean Health, Long Marine Lab
115 McAllistair Way
Santa Cruz, CA, 95076, USA
707-267-5896





> On Mar 7, 2019, at 3:00 AM, r-sig-ecology-request using r-project.org wrote:
> 
> Message: 1
> Date: Wed, 6 Mar 2019 15:50:26 +0100
> From: Attila Lengyel <lengyel.at using gmail.com <mailto:lengyel.at using gmail.com>>
> To: "r-sig-ecology using r-project.org <mailto:r-sig-ecology using r-project.org>" <r-sig-ecology using r-project.org <mailto:r-sig-ecology using r-project.org>>
> Subject: [R-sig-eco] MRPP or alike function on non-metric
> 	dissimilarity matrix
> Message-ID:
> 	<CALMWnNi=t9D5sPCQ==5kYnpHtno8dM62cFUR_Cz5wOACOBCquw using mail.gmail.com <mailto:CALMWnNi=t9D5sPCQ==5kYnpHtno8dM62cFUR_Cz5wOACOBCquw using mail.gmail.com>>
> Content-Type: text/plain; charset="utf-8"
> 
> Dear All,
> 
> I would like to test the separation of groups of observations based on a
> dissimilarity matrix but the dissimilarity matrix is strongly non-metric. I
> thought of MRPP (multi-response permutation procedure) but I don't know if
> it requires (semi-)metric dissimilarity matrix or not. Could you recommend
> a better solution?
> I would appreciate your help.
> Best regards,
> 
> Attila
> 
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