Re: [R-sig-eco] papers about using MCMC in ecological study

2011-11-25 Thread Jakub Szymkowiak
Duncan, Rob, Peter - thanks a lot for suggestions about literature! Peter - by MCMC methods I mean Markov Chain Monte Carlo ;) I have great book by Ben Bolker - Ecological Models and Data in R, but I'm searching for more examples of using MCMC in the study of habitat selection. Anyway - thanks

[R-sig-eco] papers about using MCMC in ecological study

2011-11-25 Thread Jakub Szymkowiak
Hi, I'm searching for some papers about using MCMC models in ecological study - especially in the study of habitat selection. If anyone have pdf's, references or advices in this subject - I will be very grateful. Cheers, Jakub ___ R-sig-ecology mail

Re: [R-sig-eco] MANCOVA in R

2011-11-25 Thread Michel Rapinski
Well, I've tested both linear (polynomial to be precise) models (1 for each year) using RDA in vegan. Now it's just a question of comparing them for both years to see if the trend is similar or not. Michel > > > On 25/11/2011 18:26, "Michel Rapinski" wrote: > >> Thanks for the help. >> >> What e

Re: [R-sig-eco] MANCOVA in R

2011-11-25 Thread Jari Oksanen
On 25/11/2011 18:26, "Michel Rapinski" wrote: > Thanks for the help. > > What exactly is it called if it is not a MANCOVA and how does it differ > from a true MANCOVA? > What about a (multiple) linear model? Cheers, Jari Oksanen ___ R-sig-ecology

Re: [R-sig-eco] MANCOVA in R

2011-11-25 Thread Michel Rapinski
Thanks for the help. What exactly is it called if it is not a MANCOVA and how does it differ from a true MANCOVA? Cheers, Michel > On Fri, 2011-11-25 at 10:47 +0100, marcelino.delac...@upm.es wrote: >> Hi, >> >> maybe adonis? e.g., >> >> library(vegan) >> adonis(Y~Lat+Lat2+Year+Lat:Year+Lat2:Ye

[R-sig-eco] scientifically correct annotation for residuals of a model

2011-11-25 Thread Johannes Radinger
Hello, Maybe that is a little bit offtopic, but pls have a look e.g at this plot: http://itl.nist.gov/div898/handbook/pmd/section4/plots/mvpt6_f.gif where the residuals of a model are plotted against another variable. Now I want to know if there is a scientifically correct term/string to describe

Re: [R-sig-eco] MANCOVA in R

2011-11-25 Thread Jari Oksanen
On Fri, 2011-11-25 at 10:47 +0100, marcelino.delac...@upm.es wrote: > Hi, > > maybe adonis? e.g., > > library(vegan) > adonis(Y~Lat+Lat2+Year+Lat:Year+Lat2:Year) > > Michel, This (adonis) does not do MANCOVA in its basic setting. Normal lm() does multivariate linear models when the dependent v

Re: [R-sig-eco] interpreting adonis results

2011-11-25 Thread Gavin Simpson
On Fri, 2011-11-25 at 11:41 +0200, Jari Oksanen wrote: > Howdy Folks, > > It seems that empty groups (count is zero) are the source of the > problem. You can drop them using factor() command for your interaction > -- this drops empty levels: > > mod <- betadisper(betad, factor(groupA)) > > work

Re: [R-sig-eco] MANCOVA in R

2011-11-25 Thread marcelino.delacruz
Hi, maybe adonis? e.g., library(vegan) adonis(Y~Lat+Lat2+Year+Lat:Year+Lat2:Year) Cheers, Marcelino Con fecha 25/11/2011, "Michel Rapinski" escribió: >Hi, > >I am trying to perform an MANCOVA in R with permutation tests of >significance. > >The model I want to test is: > >Y~Lat+Lat2+Year+Lat

Re: [R-sig-eco] interpreting adonis results

2011-11-25 Thread Gavin Simpson
On Sun, 2011-11-20 at 02:24 +0100, Gian Maria Niccolò Benucci wrote: > Gavin, > > May I ask you if you have tutorial for the betadisper() function? Nothing more than that which comes with vegan in the help or is contained in the Vegan tutorial, which can be accessed via: http://vegan.r-forge.r-p

Re: [R-sig-eco] interpreting adonis results

2011-11-25 Thread Jari Oksanen
On Fri, 2011-11-25 at 09:30 +, Gavin Simpson wrote: > On Sun, 2011-11-20 at 03:37 +, yy@york.ac.uk wrote: > > Thanks all for your help on adonis！！！^_^ > > Thanks Kay too...;-) > > > > > > So,I have moved on and currently working on betadisper and faced some > > problems. > > > > 1.I

Re: [R-sig-eco] interpreting adonis results

2011-11-25 Thread Gavin Simpson
On Sun, 2011-11-20 at 03:37 +, yy@york.ac.uk wrote: > Thanks all for your help on adonis！！！^_^ > Thanks Kay too...;-) > > > So,I have moved on and currently working on betadisper and faced some > problems. > > 1.In vegatutor.pdf, betadisper (pg 33), "The function can only use one > fac

Re: [R-sig-eco] autocorrelation structure

2011-11-25 Thread Marc Taylor
Thanks for the advise Gavin and Wen! Will look into these options... Cheers, Marc On Thu, Nov 24, 2011 at 9:27 PM, Wen Li wrote: > Hi again, Marc, > > You may first test the seasonality of your data use the > SeasonalMannkendall command in the Kendall Package. > > Cheers, > Li > > -Original M