Hi all,
I am wondering if there is a function available in R for simulating
spatial distribution of objects (plants in this case) in order to
simulate sampling of a population . Specifically, I would like to be
able to change the spatial correlation of individuals. I don't want
to reinvent the w
with plot(),
if you know another function, that would be great. Or if you know how
to alter the y-axis and label the two group names, that would be
great also. I have been working at it for a while and am kicking
myself for not saving the commands as a script.
Thanks,
Wade Wall
On 12/22/06,
Hi all,
I have performed an lda on two groups and have plotted using
plot(x.lda), with x.lda being my lda results. I have forgotten how to
change the labels of the of the x-axes (they are currently listed as
Group1 and Group 13), and to rescale the y-axis to reflect frequency.
If anyone knows how
Hi all,
I am trying to use the BIOENV function in the Vegan package and am
wondering if there is a way to perform the function with missing
values. Is there a way to pass use="pairwise.complete.obs" to the cor
function? Or is this the wrong way to approach it?
Thanks
Wade
_
IHi all,
have a dataset with rows as plots and environmental data as columns.
I have predicted the values using the following
ed.pred<-predict(lda.ed,ed) #lda.ed the model, ed the env. variables
used for the prediction plots
I am wanting to know the formula used by predict.lda for calculating
th
Hi all,
I ran a discriminant analysis with some data and want to get a general idea
of prediction error rate. Some have suggested using X-fold cross validation
procedure. Anyone know if there is a function for this in R?
Thanks,
Wade
[[alternative HTML version deleted]]
_
Hi all,
Is there a box's M test for R? I have looked around, but have been
unable to find it.
Thanks
Wade
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Hi all,
I have a dataframe of rownames that I would like to extract from a
larger matrix to form a new matrix. I have tried to use subset, in
this manner
x<-subset(largematrix, rownames$names=largematrix$rownames)
where largematrix is the larger matrix and rownames$names is the
dataframe with th
Hi all,
I have a matrix of 474 rows (samples) with 565 columns (variables).
each of the 474 samples belong to one of 120 groups, with the
groupings as a column in the above matrix. For example, the group
column would be:
1
1
1
2
2
2
.
.
.
120
120
I want to randomly select one from each group.
Hi all,
I am looking for a function in R to trim the last two characters of an
8 character string in a vector. For example, I have the codes
37-079-2, 370079-3,37-079-8 and want to trim them to 37-079 by
removing the last two characters. Is sub the correct function to use,
and if so how can I spe
Hi all,
I am trying to run a cluster analysis using Sorenson (Bray-Curtis) distance
measure with flexible beta linkage method. However, I can't seem to find
flexible beta in any of the functions/packages I have looked at.
Any help would be appreciated.
[[alternative HTML version deleted
ist and modifying the column names
(column 2), but to no avail. I hope this clarifies a little. Sorry about
that.
On 7/7/06, Marc Schwartz (via MN) <[EMAIL PROTECTED]> wrote:
>
> On Fri, 2006-07-07 at 11:20 -0400, Wade Wall wrote:
> > Hi all,
> >
> > I have a thr
Hi all,
I have a three columned list that I have imported into R. The first column
is a plot (ex. Plot1), the second is a species name (ex ACERRUB) and the
third a numeric value. I want to replace some of the second column names
with other names (for example replace ACERRUB with ACERDRU). The o
I have a text file that I have imported into R. It contains 3 columns and
316940 rows. The first column is vegetation plot ID, the second species
names and the third is a cover value (numeric). I imported using the
read.table function.
My problem is this. I need to reformat the information a
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