Displaying 8 results from an estimated 8 matches for "diatoms".
2008 Jul 01
2
"Invalid object" error in boxplot
Hi,
I'm trying to make a boxplot with the data at the end of the message, and when I
try to execute the command
>boxplot(Diatoms) (or for any other field instead of "Diatoms")
I get the following error message:
Error in oldClass(stats) <- cl : adding class "factor" to an invalid object
Any advice would be much appreciated.
Thanks a lot,
Miriam
Date Depth Diatoms Bacteria V1...
2011 Nov 07
2
ordination in vegan: what does downweight() do?
...o reduce the influence of rare species in my CCA. I
have read that some authors reduce rare species by only including species
with an abundance of at least 1% in at least one sample (other authors use
5% as a rule, but this removes at least half my species). If I code it as
follows:
cca(downweight(diatoms, fraction=5) ~ ., env)
It is clearly not removing these species entirely from analysis, as some
authors suggest. So I am wondering: what is downweight() doing exactly? I
assume it is somehow ranking the species and reducing their abundance values
based on their rank, but I'm not entirely sure...
2013 Apr 05
2
transforming data prior to CCA
Hi everyone,
I?m a student and relatively new to R so apologies in advance if this
question seems stupid or obvious to you.
I have collected a dataset with about 60 species of diatoms (count data from
19 different sample sites) and environmental variables for each site
(salinity, pH, etc.). It?s all in the same dataset but distinct in R through
the functions below
diat <- diatom [, 1:60] ##species
envir<- diatom [, 61:66] ##environmental variables
The long-term plan is...
2018 Jan 06
4
Error occurring in "emmeans" package for the two data sets I used. Please help.
...iven below in the
R-class. I got a typical error in "emmeans" package, please help:
Data-set-1:
--------------
Medley and Clements (1998) investigated the impact of zinc contamination
(and other heavy metals) on the diversity of diatom species in the USA
Rocky Mountains. The diversity of diatoms (number of species) and degree of
zinc contamination (categorized as either of high, medium, low or natural
background level) were recorded from between four and six sampling stations
within each of six streams known to be polluted, as given below:
stream=c("Eagle", "Eagle", &q...
2018 Jan 08
0
[FORGED] Error occurring in "emmeans" package for the two data sets I used. Please help.
...ot a typical error in "emmeans" package, please help:
>
> Data-set-1:
> --------------
> Medley and Clements (1998) investigated the impact of zinc contamination
> (and other heavy metals) on the diversity of diatom species in the USA
> Rocky Mountains. The diversity of diatoms (number of species) and degree of
> zinc contamination (categorized as either of high, medium, low or natural
> background level) were recorded from between four and six sampling stations
> within each of six streams known to be polluted, as given below:
>
> stream=c("Eagle&quo...
2018 Jan 10
0
[FORGED] Error occurring in "emmeans" package for the two data sets I used. Please help.
...iven below in the
R-class. I got a typical error in "emmeans" package, please help:
Data-set-1:
--------------
Medley and Clements (1998) investigated the impact of zinc contamination
(and other heavy metals) on the diversity of diatom species in the USA
Rocky Mountains. The diversity of diatoms (number of species) and degree of
zinc contamination (categorized as either of high, medium, low or natural
background level) were recorded from between four and six sampling stations
within each of six streams known to be polluted, as given below:
stream=c("Eagle", "Eagle", &q...
2003 Aug 02
0
Re: how l (PR#3614)
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2007 Jul 26
5
ROC curve in R
Hi,
I need to build ROC curve in R, can you please provide data steps / code
or guide me through it.
Thanks and Regards
Rithesh M Mohan
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