| Instability of
ordination |
Tausch et al. (Journal of Vegetation Science 6,
897-902; 1995) found out that some programs for Correspondence
Analysis and other vegetation data analyses gave different results
when the input order of species or sites changes. Peter
Minchin and me found that CANOCO is subject to the same instability
(Journal of Vegetation Science 8, 447-454; 1997).
Here we give some information and software to analyse and cure
the instability.
|
| Diversity hump |
Discussion on humped-back species richness model
which started with my Forum article in Journal of Ecology
84, 293-295 (1996). Here I explain briefly my point
of view.
|
| Beta and HOF
models | Discussion on
fitting beta response function in gradient model. This is
related to my paper where I criticize
the use of beta-function in gradient analysis. I provide here software to simulate vegetation
data. My argument is that fitted beta functions do not recover
the true model used in simulation, but give biased results in
general. My recommendation is to use Huisman-Olff-Fresco models instead to
estimate skewness of species responses. |
| Software | Some
ecological software, though it comes
with usual no-warranty: I don't guarantee that it works or that
it can be used for any purpose.
|
