Displaying 5 results from an estimated 5 matches for "tetrad".
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telrad
2005 Jun 05
1
Creating a large matrix
Dear all,
I have a set of data that is 2 columns wide and 35,000 rows long (see
extract below). The first column contains codes for tetrads (2km x 2km
squares within NW England) and the second column has the names of moss
species present within each tetrad. I wish to convert this into a matrix
where rows are labelled by 'Tetrad', columns are labelled by 'Moss species'
and each cell contains a 1 or 0 to denote the pres...
2003 May 02
2
stepAIC/lme (1.6.2)
Based on the stepAIC help, I have assumed that it only was for lm, aov, and
glm models. I gather from the following correspondence that it also works
with lme models.
Thomas Lumley 07:40 a.m. 28/04/03 -0700 4 Re: [R] stepAIC/lme problem
(1.7.0 only)
Prof Brian Ripley 04:19 p.m. 28/04/03 +0100 6 Re: [R] stepAIC/lme problem
(1.7.0 only)
Prof Brian Ripley 06:09 p.m. 29/04/03 +0100 6 Re: [R]
2002 Jun 20
1
new package `multcomp'
...ontrast tests, which include all
common multiple comparison procedures, such as the many-to-one
comparisons of Dunnett, the all-pairwise comparisons of Tukey and
many other procedures. We provide a list of 9
standard procedures (Dunnett, Tukey, Sequen, AVE, Changepoint,
Williams, Marcus, McDermott, Tetrade), where the user selects the
comparisons of his interest. In addition, a free input interface
for the contrast matrix allows for more special comparisons.
The comparisons itself are not restricted to balanced or simple
designs. Instead, the programs are designed to suit multiple
comparisons wit...
2002 Jun 20
1
new package `multcomp'
...ontrast tests, which include all
common multiple comparison procedures, such as the many-to-one
comparisons of Dunnett, the all-pairwise comparisons of Tukey and
many other procedures. We provide a list of 9
standard procedures (Dunnett, Tukey, Sequen, AVE, Changepoint,
Williams, Marcus, McDermott, Tetrade), where the user selects the
comparisons of his interest. In addition, a free input interface
for the contrast matrix allows for more special comparisons.
The comparisons itself are not restricted to balanced or simple
designs. Instead, the programs are designed to suit multiple
comparisons wit...
2002 Dec 01
1
generating contrast names
Dear R-devel list members,
I'd like to suggest a more flexible procedure for generating contrast
names. I apologise for a relatively long message -- I want my proposal to
be clear.
I've never liked the current approach. For example, the names generated by
contr.treatment paste factor to level names with no separation between the
two; contr.sum simply numbers contrasts (I recall an