search for: specaccum

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Hi List, I’m using the vegan function specaccum to produce a rarefaction curve. In the function’s help it says: “Function ‘specaccum’ finds species accumulation curves or the number of species for a certain number of sampled sites or individuals”. Well, I would like to finds this curve for individuals, but when I compute it the function (using t...

...plot (plot randomly choosen) ->2) move to the next plot (a different one in respect to the first and randomly selected, sampling without replacement) and whitin this second plot, select the second sector ->3) continue until 1 sector is collected for each plot (totally 219 sectors) ->4) use specaccum function ( method = "exact") to calculate "dim1_sector_curve1" object on the selected 219 sectors. ->5) save in the first column of the data.frame_1 the "dim1_sector_curve1$richness" values than (sampling with replacement) -> repeat point 1),2),3) ->4a) use sp...

Dear List, today I turn to you with a next problem. I'm trying to compare species richness between various datasets (locations) using species accumulation curves (Chapter 4, page 54 in Tree diversity analysis<http://www.worldagroforestry.org/treesandmarkets/tree_diversity_analysis.asp>by Kindt & Coe). To accomplish this I'm using package BiodiversityR. My data is comprised of

...#[1] 6 7 6 6 5 6 #[[2]] #[1] 6 5 6 5 # #[[3]] #[1] 5 A.K. ________________________________ From: Utpal Bakshi <utpalmtbi at gmail.com> To: arun <smartpink111 at yahoo.com> Sent: Saturday, March 2, 2013 2:14 PM Subject: Re: explanation of the problem.. may be you could use the specaccum function of vegan package for permutations.. the function is shown in pan genome script file.. On Sun, Mar 3, 2013 at 12:39 AM, arun <smartpink111 at yahoo.com> wrote: Another problem, is that with this combinations of many columns will be computationally intensive. > > > >...

Hello, I'm creating a loop to work with vegan, to get a species abundance curve. Here I send the script I've created and also an excel file to prove what it can do. Well, I have a database with 20 years, and each year we have sampled 19 stratum, and in each estratum we have carry out some sumpling. Then, with the script that I've sent I've got to calculate the species abundance

dear R-friends, i`ve got a large dataset of vegetation-samples with about 500 variables(=species) in the following format: 1 spec1 1 spec23 1 spec54 1 spec63 2 spec1 2 spec2 2 spec253 2 spec300 2 spec423 3 spec20 3 spec88 3 spec121 3 spec200 3 spec450 . . this means: sample 1 (grassland) with the species (=spec) 1, 23, 54, 63 is it possible to get a following data-structure for further

Hello, I have a data set with 9700 records, and 7 parameters. The data were collected for a survey of forest communities. Sample plots (1009) and species (139) are included in this data set. I need to determine how species are accumulated as new plots are considered. Basically, I want to develop a species area curve. I've included the first 20 records from the data set. Point