Publications by R on The broken bridge between biologists and statisticians
Analysing seed germination and emergence data with R: a tutorial. Part 3
This is a follow-up post. If you are interested in other posts of this series, please go to: https://www.statforbiology.com/tags/drcte/ Reshaping time-to-event data The first thing we should consider before working through this tutorial is the structure of germination/emergence data. To our experience, seed scientists are used to storing their d...
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Principal Component Analysis: a brief intro for biologists
In this post I am revisiting the concept of Principal Component Analysis (PCA). You might say that there is no need for that, as the Internet is full with posts relating to such a rather old technique. However, I feel that, in those posts, the theoretical aspects are either too deeply rooted in maths or they are skipped altogether, so that the ma...
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Biplots are everywhere: where do they come from?
Principal Component Analysis (PCA) is perhaps the most widespread multivariate technique in biology and it is used to summarise the results of experiments in a wide range of disciplines, from agronomy to botany, from entomology to plant pathology. Whenever possible, the results are presented by way of a biplot, an ubiquitous type of graph with a ...
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Analysing seed germination and emergence data with R: a tutorial. Part 4
This is a follow-up post. If you are interested in other posts of this series, please go to: https://www.statforbiology.com/tags/drcte/ Time-to-event models for seed germination/emergence The individual seeds within a population do not germinate/emerge altogether at the same moment; this is an undisputed fact, resulting from seed-to-seed variabi...
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Analysing seed germination and emergence data with R: a tutorial. Part 5
This is a follow-up post. If you are interested in other posts of this series, please go to: https://www.statforbiology.com/tags/drcte/ Comparing germination/emergence for several seed lots Very often, seed scientists need to compare the germination behavior of different seed populations, e.g., different plant species, or one single plant specie...
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Analysing seed germination and emergence data with R (a tutorial). Part 6
This is a follow-up post. If you are interested in other posts of this series, please go to: https://www.statforbiology.com/tags/drcte/ Fitting time-to-event models with environmental covariates In the previous post we have shown that time-to-event curves (e.g., germination or emergence curves) can be used to describe the time course of germinat...
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