Richard Telford’s Blog
@richardjtelford
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Tag Archives: R
Colour coding points in a graph
Sometimes it is useful to colour code points on a graph according to a categorical variable. There are, as always, several ways to do this. It would be possible to use nested ifelse() statements, but that way lies insanity if … Continue reading
Overlaying core and calibration set samples in an ordination
One visualisation technique I frequently use is to make an ordination showing the modern calibration set sites, the fossil core data, and contours of an environmental variable. Here, I’ve used non-metric multidimensional scaling to ordinate the core and calibration data … Continue reading
Doubly re-ordered data matrices
A useful method for exploring and visualising the main patterns in community data is a doubly reordered data matrix, with the species abundance indicated by either the size of a symbol or shading. In this example, I’ve used the dune … Continue reading
Musings on Quantitative Palaeoecology 