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Category Archives: Palaeoecology
Monotonic deshrinking in weighted averaging models
Weighted averaging regression and calibration is the most widely used method for developing a palaeolimnological transfer function. Such models are used to reconstruct properties of the past lake environment such as pH, total phosphorus, and water temperature with, it has … Continue reading
Posted in analogue, Palaeoecology, Palaeolimnology, R
Tagged deshrinking, Statistics, transfer function, weighted averaging
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A new version of analogue for a new year
Yesterday I rolled up a new version (0.10-0) of analogue, my R package for analysing palaeoecological data. It is now available from CRAN. There were lots of incremental changes to Stratiplot() to improve the quality of the stratigraphic diagrams produced … Continue reading
Processing sample labels using regular expressions in R
I am often found in possession of palaeo core data where the sample identifiers contain a core code or label plus the sample depth. Often these are things generated by colleagues who have used other software where for one reason … Continue reading
Posted in Palaeoecology, Palaeolimnology, R
Tagged data processing, regular expression, sediment core
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What’s wrong with LOESS for palaeo data?
Locally weighted scatterplot smoothing (LOWESS) or local regression (LOESS) is widely used to highlight “signal” in variables from stratigraphic sequences. It is a user-friendly way of fitting a local model that derives its form from the data themselves rather than having … Continue reading
Posted in Palaeoecology, Palaeolimnology, R, Science, Time series
Tagged autocorrelation, cross-validation, GCV, LOESS, overfitting
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Quantitative palaeolimnology: my book chapters are finally out!
Today I received confirmation that the delayed fifth volume in the Developments in Palaeoenvironmental Research series has been published. The book is titled Data Handling and Numerical methods, though it covers more of the latter and, IMHO, is far more interesting than … Continue reading
Posted in analogue, Palaeoecology, Palaeolimnology, R, Science, vegan
Tagged Numerical analysis, Palaeolimnology, Statistics
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Course: Analysing Palaeolimnological Data with R
Update: As of 18 April 2012 the course is now fully subscribed. Should you wish to be placed on a waiting list please contact Steve Juggins. Analysing Palaeolimnological Data with R 16th — 20th August 2012, University Marine Biological Station … Continue reading
Posted in analogue, Palaeoecology, Palaeolimnology, R, Science, vegan
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