Author Archives: richard telford

About richard telford

Ecologist with interests in quantitative methods and palaeoenvironments

Bergen: a year with some sunshine

May was glorious.  December less so. The data are from the Geofysisk Institutt in Bergen. Here is the code I used Advertisements

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More trouble counting to fifty

Earlier this week at the palaeolimnology symposium, Gavin told me that it had not dawned on him that the count sum could be estimated from percent data using our knowledge of rank abundance curves. I only recently realised this; previously … Continue reading

Posted in Misconduct, Peer reviewed literature | Tagged | 3 Comments

My presentation to IPA-IAL 2018

I’ve just given a presentation at the joint IPA-IAL conference in Stockholm Sub-decadal resolution palaeoenvironmental reconstructions from microfossil assemblages Download it! The deadline for applying for a reward for finding typos has expired.

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How many is fifty? Sanity checks for assemblage data.

This week I’m at the Palaeolimnology Symposium in Stockholm this week. I have a couple of presentations. I gave the first this morning to the chironomid “DeadHead” meeting. I showed some sanity checks for assemblage data, some of which are … Continue reading

Posted in Data manipulation, EDA | Tagged , | 1 Comment

Warm summers in the Younger Dryas?

The Younger Dryas was a period (12,900–11,600 BP) towards the end of the last glaciation when glaciers re-advanced in Scotland and the tundra plants, including the eponymous Dryas, replaced the Bølling-Allerød forests in Denmark. These changes indicate the Younger Dryas was … Continue reading

Posted in climate, Peer reviewed literature, transfer function | Tagged , | 1 Comment

Statigraphic diagrams with ggplot

rioja::strat.plot is a great tool for plotting stratigraphic plots in R, but sometimes it is not obvious how to do something I want, perhaps a summary panel showing the percent trees/shrubs/herbs. Of course, I could extend strat.plot, but I do … Continue reading

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How to calculate percent from counts in R

Micropaleontologists and others often want to calculate percent from count data. From looking at archived data, I realise that what should be an easy process goes wrong far more often that it should (which is of course never). Yesterday, I … Continue reading

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