tadd mcmc methods - cosmo - front and backend for Markov-Chain Monte Carlo inversion of cosmogenic nuclide concentrations (HTM) git clone git://src.adamsgaard.dk/cosmo (DIR) Log (DIR) Files (DIR) Refs (DIR) README (DIR) LICENSE --- (DIR) commit 4769723624cf47e9a1c827ebe1388971f8616e2c (DIR) parent c61d24deab6ce81dcb4e8b538cab571d035beb2e (HTM) Author: Anders Damsgaard <anders.damsgaard@geo.au.dk> Date: Fri, 27 Nov 2015 15:34:25 +0100 add mcmc methods Diffstat: M pages/methods.html | 26 ++++++++++++++++++++++++-- 1 file changed, 24 insertions(+), 2 deletions(-) --- (DIR) diff --git a/pages/methods.html b/pages/methods.html t@@ -52,13 +52,35 @@ <div id="mcmc" class="section scrollspy"> <h3 class="header blue-text"> Markov-Chain Monte Carlo (MCMC) basics</h3> - <p>bla bla</p> + <p>The inversion problem of turning observed TCN + concentrations into erosion histories is handled using a + conventional Metropolis-Hastings MCMC approach where the + model parameters are constrained between fixed model + parameter bounds specified by the user. Erosion rates + (ε<sub>int</sub>, ε<sub>gla</sub>), which + may vary over several orders of magnitude, are specified + with uniform probability across the logarithmic parameter + interval. The temporal parameter (<i>t</i><sub>degla</sub>) + and climate record threshold value + (δ<sup>18</sup>O<sub>threshold</sub>) is specified + with uniform probability across the linear + parameter interval. The user specifies the bounds + of the model parameters, which define the model space. + </p> </div> <div id="mcmcwalker" class="subsection scrollspy"> <h4 class="header blue-text light"> What is a MCMC walker?</h4> - <p>bla bla</p> + <p> + forward responses are computed based on an initial set of + model parameters that is proposed using the + Metropolis-Hastings technique. A burn-in phase of 1000 + iterations is first used to make a crude initial search of + the model space. This step is followed by a more detailed + and local search of the model space based on the best-fit + model parameters from the burn-in phase. + </p> </div> <div id="twostage" class="section scrollspy">