theoreticalecology.wordpress.com
Explaining the ABC-Rejection Algorithm in R | theoretical ecology
https://theoreticalecology.wordpress.com/2014/06/02/explaining-the-abc-rejection-algorithm-in-r
Notes from ecology, biogeography and evolution by Florian Hartig. Explaining the ABC-Rejection Algorithm in R. June 2, 2014. About estimating models with the ABC-MCMC algorithm proposed by Marjoram (2003). As well as about. To the ABC approximation, such as the use of synthetic likelihoods. All of those were based on MCMC methods. However, some recent work made me appreciate the usefulness of the “father” of all ABC algorithms, the ABC rejection sampler first proposed by Tavare (1997). N = 20000 fit = da...
theoreticalecology.wordpress.com
All models are wrong, but which are useful for understanding the effect of nestedness on plant-pollinator dynamics? | theoretical ecology
https://theoreticalecology.wordpress.com/2015/04/23/all-models-all-wrong-but-which-are-useful-for-understanding-the-effect-of-nestedness-on-plant-pollinator-dynamics
Notes from ecology, biogeography and evolution by Florian Hartig. All models are wrong, but which are useful for understanding the effect of nestedness on plant-pollinator dynamics? April 23, 2015. A guest post by Gita Benadi. Real networks tend to have a nested structure, in which specialists interact mostly with generalists (Fig. 1);. Nestedness increases the stability of mutualistic networks, which likely is the reason for (1). On the other hand, it’s easy to find biological examples for asymmetric sp...
theoreticalecology.wordpress.com
Back from Bayes IV | theoretical ecology
https://theoreticalecology.wordpress.com/2014/09/24/back-from-bayes-iv
Notes from ecology, biogeography and evolution by Florian Hartig. Back from Bayes IV. September 24, 2014. Group photo of the Bayes summer school at Lygra, Norway. As announced a while ago. We had moved our now already traditional summer school in Bayesian Statistics. And the group was fantastic as well, thank you guys! Below a few twitter photos and some nerdy tweets from #lygrabayes. 8211; Paul’s suggestion. To establish #bayesjokes has been noted😉. Mdash; Béatrice Wedeux (@beawedeux) September 20, 2014.
theoreticalecology.wordpress.com
A simple explanation of rejection sampling in R | theoretical ecology
https://theoreticalecology.wordpress.com/2015/04/22/a-simple-explanation-of-rejection-sampling-in-r
Notes from ecology, biogeography and evolution by Florian Hartig. A simple explanation of rejection sampling in R. April 22, 2015. The central quantity in Bayesian inference, the posterior, can usually not be calculated analytically, but needs to be estimated by numerical integration, which is typically done with a Monte-Carlo algorithm. The three main algorithm classes for doing so are. Markov-Chain Monte Carlo (MCMC) sampling. Sequential Monte Carlo (SMC) sampling. 1 draw random value from the prior.
theoreticalecology.wordpress.com
3-year PostDoc Position on Connecting Forest Models, Data and Diversity Effects in Freiburg | theoretical ecology
https://theoreticalecology.wordpress.com/2014/11/19/3-year-postdoc-position-on-connecting-forest-models-data-and-diversity-effects-in-freiburg
Notes from ecology, biogeography and evolution by Florian Hartig. 3-year PostDoc Position on Connecting Forest Models, Data and Diversity Effects in Freiburg. November 19, 2014. NOTE: the position has been filled! We still seek applicants for a 3-yr PostDoc project that combines process-based forest models, Bayesian parameter estimation and ecologically the question of what processes cause diversity effects in temperate forests. A pdf with details of the call can be downloaded here. November 19, 2014.
theoreticalecology.wordpress.com
International Summer School: Introduction to Bayesian Statistics 13. – 18. Sept 2015, Bergen, Norway | theoretical ecology
https://theoreticalecology.wordpress.com/2015/07/05/international-summer-school-introduction-to-bayesian-statistics-13-18-sept-2015-bergen-norway
Notes from ecology, biogeography and evolution by Florian Hartig. International Summer School: Introduction to Bayesian Statistics 13. – 18. Sept 2015, Bergen, Norway. July 5, 2015. For a few years now, Jörn Pagel. In the beginning) and I have been teaching an introductory summer school in Bayesian statistics. In previous years, we were in Bayreuth 2011. This year, we will be again in Lygra, a beautiful. Field station close to Bergen, Norway. Topics of the summer school will include. July 5, 2015. ISI 20...
theartofmodelling.wordpress.com
Do we need to derive mechanistic error distributions for deterministic models? | Just Simple Enough: The Art of Mathematical Modelling
https://theartofmodelling.wordpress.com/2012/05/28/do-we-need-to-derive-mechanistic-error-distributions-for-deterministic-models
Just Simple Enough: The Art of Mathematical Modelling. Exploring the secrets of successful mathematical models. Skip to primary content. Do we need to derive mechanistic error distributions for deterministic models? May 28, 2012. Do mechanistic, deterministic mathematical models necessarily have to have error distributions that are mechanistically derived? Measurement error: y(t) = f(x(t), b) e. Process (or demographic) error: y(t) = f(x(t) e, b). A second justification of the simple approach, could be t...
theoreticalecology.wordpress.com
Female hurricanes reloaded – another reanalysis of Jung et al. | theoretical ecology
https://theoreticalecology.wordpress.com/2014/06/06/female-hurricanes-reloaded-another-reanalysis-of-jung-et-al
Notes from ecology, biogeography and evolution by Florian Hartig. Female hurricanes reloaded – another reanalysis of Jung et al. June 6, 2014. I have blogged a few days a ago. As you can read in my previous post, the study seemed rather convincing to me, if a bit surprising in its findings. But there was correlation in the regression, and there were the experiments which show why this correlation would occur. Plus, PNAS is a large journal, they would have this properly vetted, right? Bob’s argument...
theoreticalecology.wordpress.com
New paper on the biodiversity impacts of the reformed EU common agricultural policy (CAP) | theoretical ecology
https://theoreticalecology.wordpress.com/2014/06/05/new-paper-on-the-biodiversity-impacts-of-the-reformed-eu-common-agricultural-policy-cap
Notes from ecology, biogeography and evolution by Florian Hartig. New paper on the biodiversity impacts of the reformed EU common agricultural policy (CAP). June 5, 2014. I have strayed on quite applied territory, by coauthoring a paper on the biodiversity impacts of the recently enacted reform of the EU common agricultural policy (CAP). In tomorrow’s issue of Science. I hope the opening paragraph does a good job at summarizing the main point. For details, check out the paper. It’s short enough. ISI 2013...
dynamicecology.wordpress.com
How disturbance and environmental fluctuations actually affect coexistence: part 3 (UPDATED) | Dynamic Ecology
https://dynamicecology.wordpress.com/2012/08/22/how-disturbance-and-environmental-fluctuations-actually-affect-coexistence-part-3
Skip to primary content. How disturbance and environmental fluctuations actually affect coexistence: part 3 (UPDATED). August 22, 2012. This post is part 3 in a series. You should read parts 1. If you haven’t already done so, otherwise this post won’t make much sense. For instance, as a mathematically-simple illustration, imagine a two species resource competition model in which the dynamics of species 1 are given by (UPDATE: typo fixed):. Is resource density,. Is the per-capita mortality rate, and.
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